diff --git a/CMakeLists.txt b/CMakeLists.txt
index cffba35..0e8d5bb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,12 +25,12 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 include(FetchContent)
 
-set(BOOST_INCLUDE_LIBRARIES asio assert core endian json mqtt5 fusion optional random range smart_ptr spirit type_traits)
+set(BOOST_INCLUDE_LIBRARIES asio assert core endian json mqtt5 fusion optional random range smart_ptr spirit type_traits url)
 set(BOOST_ENABLE_CMAKE ON)
 set(Boost_NO_SYSTEM_PATHS ON)
 set(BOOST_ROOT /usr/local/boost-1.89)
 
-find_package(Boost 1.89 REQUIRED COMPONENTS json mqtt5)
+find_package(Boost 1.89 REQUIRED COMPONENTS json mqtt5 url)
 # spdlog
 
 include(CheckCXXSourceCompiles)
diff --git a/config.hpp b/config.hpp
index b41c9c0..ba6a094 100644
--- a/config.hpp
+++ b/config.hpp
@@ -4,6 +4,8 @@
 #include <boost/system/errc.hpp>
 #include <boost/system/error_code.hpp>
 
+#include <memory_resource>
+
 #if __has_include(<expected>)
 #include <expected>
 #elif __has_include(<tl/expected.hpp>)
@@ -14,6 +16,10 @@
 
 namespace ranczo {
 
+template<typename T>
+std::optional<T> from_string(std::optional< std::string_view > state,
+  std::pmr::memory_resource * mr = std::pmr::get_default_resource());
+
 #if __has_include(<expected>)
 template < typename T >
 using expected = std::expected< T, boost::system::error_code >;
diff --git a/libs/CMakeLists.txt b/libs/CMakeLists.txt
index 4d2d477..1fd8389 100644
--- a/libs/CMakeLists.txt
+++ b/libs/CMakeLists.txt
@@ -1,6 +1,7 @@
 include(modbus.cmake)
 
 find_package(SQLite3)
+find_package(OpenSSL REQUIRED)
 
 add_library(ranczo-io_utils
     mqtt_client.cpp     ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/mqtt_client.hpp
@@ -9,6 +10,7 @@ add_library(ranczo-io_utils
     asio_watchdog.cpp   ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/asio_watchdog.hpp
     modbus.cpp          ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/modbus.hpp
     config.cpp          ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/config.hpp
+    http.cpp            ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/http.hpp
     
     ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/mqtt_topic_builder.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/ranczo-io/utils/memory_resource.hpp
@@ -30,6 +32,9 @@ target_link_libraries(ranczo-io_utils
         fmt::fmt
         modbus
         date::date
+        OpenSSL::SSL #http
+        OpenSSL::Crypto
+        Boost::url
     PRIVATE
         SQLite::SQLite3
 )
diff --git a/libs/http.cpp b/libs/http.cpp
new file mode 100644
index 0000000..ade5c18
--- /dev/null
+++ b/libs/http.cpp
@@ -0,0 +1,176 @@
+#include <boost/asio/redirect_error.hpp>
+#include <boost/asio/use_awaitable.hpp>
+#include <ranczo-io/utils/http.hpp>
+
+#include <boost/asio/ssl.hpp>
+#include <boost/beast/core.hpp>
+#include <boost/beast/http.hpp>
+#include <boost/beast/ssl.hpp>
+#include <boost/url.hpp>
+
+#include <string_view>
+
+namespace ranczo {
+
+using tcp       = boost::asio::ip::tcp;
+namespace asio  = boost::asio;
+namespace beast = boost::beast;
+namespace http  = beast::http;
+
+using PmrCharAlloc  = std::pmr::polymorphic_allocator< char >;
+using PmrFields     = http::basic_fields< PmrCharAlloc >;
+using PmrStringBody = http::basic_string_body< char, std::char_traits< char >, PmrCharAlloc >;
+using PmrFlatBuffer = boost::beast::basic_flat_buffer< PmrCharAlloc >;
+using PmrResponse   = http::response< PmrStringBody, PmrFields >;
+using PmrRequest    = http::request< PmrStringBody, PmrFields >;
+
+expected< HttpGetClient::ParsedUrl > HttpGetClient::parse_url_generic(std::string_view url) {
+    ParsedUrl out;
+    namespace urls = boost::urls;
+
+    auto r = urls::parse_uri(url);
+    if(!r) {
+        return unexpected(r.error());
+    }
+
+    urls::url_view u = *r;
+
+    out.scheme = std::string(u.scheme());
+    out.host   = std::string(u.host());
+
+    // ścieżka
+    out.target = std::string(u.encoded_path());
+    if(out.target.empty())
+        out.target = "/";
+
+    // query (bez fragmentu)
+    if(!u.encoded_query().empty()) {
+        out.target += "?";
+        out.target += std::string(u.encoded_query());
+    }
+
+    // port
+    if(!u.port().empty()) {
+        out.port = u.port_number();
+    } else {
+        if(out.scheme == "https")
+            out.port = 443;
+        else
+            out.port = 80;
+    }
+
+    out.use_ssl = (out.scheme == "https");
+
+    return out;
+}
+
+awaitable_expected< std::pmr::string > HttpGetClient::async_get(std::string_view url, std::pmr::memory_resource * mr) {
+    BOOST_ASSERT(mr);
+    namespace ssl = boost::asio::ssl;
+
+    PmrCharAlloc alloc{mr};
+
+    // 1. Parse URL
+    auto parsed_exp = parse_url_generic(url);
+    if(!parsed_exp) {
+        co_return unexpected(parsed_exp.error());
+    }
+    auto parsed = *parsed_exp;
+
+    beast::error_code ec;
+
+    // 2. Resolver
+    tcp::resolver resolver{executor()};
+    auto results = co_await resolver.async_resolve(parsed.host, std::to_string(parsed.port), asio::redirect_error(asio::use_awaitable, ec));
+    if(ec) {
+        co_return unexpected(ec);
+    }
+
+    // 3. Request na PMR
+    http::request< PmrStringBody, PmrFields > req{http::verb::get, parsed.target, 11, PmrStringBody::value_type{alloc}, PmrFields{alloc}};
+    req.set(http::field::host, parsed.host);
+    req.set(http::field::user_agent, "ranczo-http-client");
+
+    // 4. Wspólne rzeczy dla HTTP/HTTPS
+    PmrFlatBuffer buffer{alloc};
+    PmrResponse res{std::piecewise_construct, std::make_tuple(PmrStringBody::value_type{alloc}), std::make_tuple(PmrFields{alloc})};
+
+    if(!parsed.use_ssl) {
+        // ---------------------- HTTP (bez TLS) ----------------------
+        beast::tcp_stream stream{executor()};
+        stream.expires_after(_timeout);
+
+        co_await stream.async_connect(results, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        co_await http::async_write(stream, req, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        co_await http::async_read(stream, buffer, res, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        stream.socket().shutdown(tcp::socket::shutdown_both, ec);
+        // błąd przy shutdown zwykle ignorujemy
+    } else {
+        // ---------------------- HTTPS (TLS) ----------------------
+        ssl::context ctx{ssl::context::tls_client};
+
+        // Uwaga: do prawdziwego użycia:
+        //  - ctx.set_default_verify_paths();
+        //  - ctx.set_verify_mode(ssl::verify_peer);
+        // Tu dla testów najprościej wyłączyć weryfikację:
+        ctx.set_verify_mode(ssl::verify_none);
+
+        beast::ssl_stream< beast::tcp_stream > stream{executor_, ctx};
+
+        auto & lowest = beast::get_lowest_layer(stream);
+        lowest.expires_after(_timeout);
+
+        co_await lowest.async_connect(results, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        // (opcjonalnie) SNI – przydatne dla częsci serwerów
+        if(!SSL_set_tlsext_host_name(stream.native_handle(), parsed.host.c_str())) {
+            ec = beast::error_code(static_cast< int >(::ERR_get_error()), asio::error::get_ssl_category());
+            co_return unexpected(ec);
+        }
+
+        co_await stream.async_handshake(ssl::stream_base::client, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        co_await http::async_write(stream, req, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        co_await http::async_read(stream, buffer, res, asio::redirect_error(asio::use_awaitable, ec));
+        if(ec) {
+            co_return unexpected(ec);
+        }
+
+        // shutdown TLS
+        co_await stream.async_shutdown(asio::redirect_error(asio::use_awaitable, ec));
+        // tu też często dostaniesz EOF – można zignorować
+    }
+
+    // Opcjonalnie możesz sprawdzić status:
+    // if (res.result() != http::status::ok) { ... }
+
+    // Body korzysta z tego samego PMR
+    std::pmr::string body{alloc};
+    body = res.body(); // kopia na tym samym allocatorze (bez dużych kosztów w mr)
+
+    co_return body;
+}
+
+} // namespace ranczo
diff --git a/libs/modbus.cpp b/libs/modbus.cpp
index 154208c..6d0fb1c 100644
--- a/libs/modbus.cpp
+++ b/libs/modbus.cpp
@@ -123,8 +123,11 @@ awaitable_expected< T > ModbusTcpContext::call_with_lock(F && op) {
         out = ctx_.get();
         return op(out);
     });
+    
+    
 }
 
+
 template < typename T, typename Maker >
 awaitable_expected< T > ModbusTcpContext::async_call(Maker && maker) {
     namespace asio = boost::asio;
@@ -155,6 +158,7 @@ awaitable_expected< uint16_t > ModbusDevice::async_read_holding_register(uint16_
             _log.error("modbus_set_slave address {} failed with {}", address, errno);
             return unexpected(errno_errc());
         }
+        
         uint16_t val = 0;
         int rc       = ::modbus_read_registers(c, static_cast< int >(address), 1, &val);
         if(rc == -1) {
@@ -165,6 +169,29 @@ awaitable_expected< uint16_t > ModbusDevice::async_read_holding_register(uint16_
     });
 }
 
+awaitable_expected<std::pmr::vector<uint16_t> > ModbusDevice::async_read_holding_registers(uint16_t address, std::size_t number, std::pmr::memory_resource *mr)
+{
+    BOOST_ASSERT(mr);
+    address -= 1;
+    auto ctx = ctx_; // kopia shared_ptr dla bezpieczeństwa w tasku
+    co_return co_await ctx->call_with_lock< std::pmr::vector< std::uint16_t > >(
+      [this, address, mr, number](modbus_t * c) -> expected< std::pmr::vector< std::uint16_t > > {
+          if(::modbus_set_slave(c, unit_id_) == -1) {
+              _log.error("modbus_set_slave address {} failed with {}", address, errno);
+              return unexpected(errno_errc());
+          }
+
+          std::pmr::vector< std::uint16_t > val{mr};
+          val.resize(number);
+          int rc = ::modbus_read_registers(c, static_cast< int >(address), number, val.data());
+          if(rc == -1) {
+              _log.error("modbus_read_registers address {} failed with {}", address, errno);
+              return unexpected(errno_errc());
+          }
+          return val;
+      });
+}
+
 awaitable_expected< void > ModbusDevice::async_write_coil(uint16_t address, bool value) {
     auto ctx = ctx_;
     co_return co_await ctx->call_with_lock< void >([this, address, value](modbus_t * c) -> expected< void > {
diff --git a/libs/ranczo-io/utils/http.hpp b/libs/ranczo-io/utils/http.hpp
new file mode 100644
index 0000000..48094d9
--- /dev/null
+++ b/libs/ranczo-io/utils/http.hpp
@@ -0,0 +1,84 @@
+
+#include <chrono>
+#include <config.hpp>
+#include <cstddef>
+#include <memory>
+#include <memory_resource>
+#include <ranczo-io/utils/logger.hpp>
+#include <string>
+#include <string_view>
+
+#include <boost/asio/ip/tcp.hpp>
+
+namespace ranczo {
+class BaseIO {
+  public:
+    using allocator_type = std::pmr::polymorphic_allocator< std::byte >;
+
+    BaseIO()
+     : resource_(std::pmr::get_default_resource()), _log{spdlog::default_logger(), "Client"}, executor_{boost::asio::system_executor()} {}
+
+    BaseIO(boost::asio::any_io_executor ex,
+      std::string_view log_name       = "Client",
+      std::pmr::memory_resource * res = std::pmr::get_default_resource())
+     : resource_(res), _log{spdlog::default_logger(), log_name}, executor_{ex} {}
+
+    BaseIO(std::allocator_arg_t, const allocator_type & alloc, boost::asio::any_io_executor ex, std::string_view log_name = "Client")
+     : resource_(alloc.resource()), _log{spdlog::default_logger(), log_name}, executor_{ex} {}
+
+    allocator_type get_allocator() const noexcept {
+        return allocator_type{resource_};
+    }
+
+    std::pmr::memory_resource * get_resource() const noexcept {
+        return resource_;
+    }
+
+    boost::asio::any_io_executor executor() const noexcept {
+        return executor_;
+    }
+
+    ModuleLogger & log() noexcept {
+        return _log;
+    }
+    const ModuleLogger & log() const noexcept {
+        return _log;
+    }
+
+    ModuleLogger _log;
+
+  protected:
+    // chronione, aby klasy pochodne mogły korzystać
+    std::pmr::memory_resource * resource_;
+    boost::asio::any_io_executor executor_;
+};
+
+class HttpGetClient : public BaseIO {
+  public:
+    explicit HttpGetClient(boost::asio::any_io_executor executor)
+     : BaseIO{std::allocator_arg, allocator_type{std::pmr::get_default_resource()}, executor, "HttpClient"} {}
+
+    explicit HttpGetClient(std::allocator_arg_t t, const allocator_type & a, boost::asio::any_io_executor executor)
+     : BaseIO{t, a, executor, "HttpClient"} {}
+
+    struct ParsedUrl {
+        std::string scheme;
+        std::string host;
+        std::uint16_t port;
+        std::string target; // path + query
+        bool use_ssl;
+    };
+    /// Prosty helper: parsuje URL na scheme/host/port/target
+    expected< ParsedUrl > parse_url_generic(std::string_view url);
+    awaitable_expected< std::pmr::string > async_get(std::string_view url, std::pmr::memory_resource * mr);
+
+  private:
+    std::chrono::steady_clock::duration _timeout{std::chrono::seconds{5}};
+};
+
+} // namespace ranczo
+
+namespace std {
+template <>
+struct uses_allocator< ranczo::HttpGetClient, ranczo::HttpGetClient::allocator_type > : true_type {};
+} // namespace std
diff --git a/libs/ranczo-io/utils/modbus.hpp b/libs/ranczo-io/utils/modbus.hpp
index 7cc54a2..28a272a 100644
--- a/libs/ranczo-io/utils/modbus.hpp
+++ b/libs/ranczo-io/utils/modbus.hpp
@@ -12,6 +12,7 @@
 #include <chrono>
 #include <cstdint>
 #include <memory>
+#include <memory_resource>
 #include <string>
 // libmodbus (C)
 #include <modbus/modbus.h>
@@ -78,10 +79,19 @@ class ModbusDevice {
     }
 
     // FC 0x03: pojedynczy holding register
-    awaitable_expected< std::uint16_t > async_read_holding_register(std::uint16_t address);
+    awaitable_expected< std::uint16_t > async_read_holding_register( //
+      std::uint16_t address);
+
+    // FC 0x03: wiele holding registers
+    awaitable_expected< std::pmr::vector< std::uint16_t > > async_read_holding_registers( //
+      std::uint16_t address,
+      std::size_t number,
+      std::pmr::memory_resource * mr = std::pmr::get_default_resource());
 
     // FC 0x05 – ZAPIS CEWKI (coil/bit): true=ON, false=OFF
-    awaitable_expected< void > async_write_coil(std::uint16_t address, bool value);
+    awaitable_expected< void > async_write_coil( //
+      std::uint16_t address,
+      bool value);
 
   private:
     static boost::system::error_code errno_errc() {
diff --git a/libs/ranczo-io/utils/mqtt_topic_builder.hpp b/libs/ranczo-io/utils/mqtt_topic_builder.hpp
index 04e6ce2..6e7b2ab 100644
--- a/libs/ranczo-io/utils/mqtt_topic_builder.hpp
+++ b/libs/ranczo-io/utils/mqtt_topic_builder.hpp
@@ -7,7 +7,6 @@
 #include <string>
 #include <string_view>
 
-
 /**
  * Topic layout assumptions
  *
@@ -41,7 +40,6 @@
  *   Jest wyłącznie kanałem, na którym urządzenie publikuje swój stan.
  */
 
-
 namespace ranczo {
 template < typename... Args >
 constexpr size_t length(const Args &... args) {
@@ -118,7 +116,7 @@ namespace topic {
         publishState(std::string_view room, int zone = 1, std::pmr::memory_resource * mr = std::pmr::get_default_resource()) {
             using namespace std::string_view_literals;
             BOOST_ASSERT(mr);
-            return buildPublishTopic(*mr, room, "heating"sv, "floor"sv, zone, "state"sv);
+            return buildPublishTopic(*mr, room, "heating"sv, "floor"sv, zone, "state"sv); // TODO powalczyć z prawidłowym nazwenictwem
         }
     } // namespace heating
 
@@ -142,42 +140,69 @@ namespace topic {
         }
 
     } // namespace temperature
-    
-    namespace utilities{
-        // home/utilities/power/<meter>/<kind>/<channel>
+
+    namespace utilities {
         /*
-         * <meter>: main, heating, housing
-         * <kind>: active, reactive, apparent, voltage, current, frequency, pf 
-         * <channel>: total, L1, L2, L3 itp.
-         */
-        inline std::pmr::string
-        publishPowerReading(std::string_view meter, std::string_view kind, std::string_view channel, std::pmr::memory_resource * mr = std::pmr::get_default_resource()) {
+          group – „rodzaj wielkości” (measurement / power / energy / flow / volume / …)
+          medium – nośnik (electricity / water / gas / …)
+          meter – który licznik (main / heating / housing / …)
+          measurement – co dokładnie (voltage / current / active / reactive / flow / volume / …)
+          channel – kanał / faza / obwód (L1 / L2 / total / loop1 / …)
+
+          home/utilities/flow       /water      /main/flow   /heating_loop
+          home/utilities/flow       /water      /main/flow   /domestic
+          home/utilities/power      /electricity/main/active /L1
+          home/utilities/measurement/electricity/main/voltage/L1
+
+        # home/utilities/flow/water/main/flow/total
+        # group          ^^^^                       [flow | power | energy]
+        # medium              ^^^^                  [water | electricity]
+        # meter                     ^^^^            [main]
+        # measurement                    ^^^^       [flow | volume]
+        # channel                             ^^^^^ [domestic | well]
+        */
+
+        inline std::pmr::string _make_topic(std::pmr::memory_resource * mr,
+          std::string_view group,
+          std::string_view medium,
+          std::string_view meter,
+          std::string_view measurement,
+          std::string_view channel) {
+            using namespace std::string_view_literals;
+            return make_topic(*mr, "home"sv, "utilities"sv, group, medium, meter, measurement, channel);
+        }
+
+        inline std::pmr::string publishPowerReading(std::string_view meter,
+          std::string_view measuremetn,
+          std::string_view channel,
+          std::pmr::memory_resource * mr = std::pmr::get_default_resource()) {
             BOOST_ASSERT(mr);
             BOOST_ASSERT(meter.size());
             BOOST_ASSERT(kind.size());
             BOOST_ASSERT(channel == "total" || channel == "L1" || channel == "L2" || channel == "L3");
             using namespace std::string_view_literals;
-            return make_topic(*mr, "home"sv, "utilities"sv, "power"sv, "electricity"sv, meter, kind, channel);
+            return _make_topic(mr, "power"sv, "electricity"sv, meter, measuremetn, channel);
         }
-        
+
         // home/utilities/energy/<meter>/<kind>/<channel>
         /*
          * <meter>: main, heating, housing
-         * <kind>: tatol_active_energy  
+         * <kind>: tatol_active_energy
          * <channel>: total, L1, L2, L3 itp.
          */
-        inline std::pmr::string
-        publishEnergyReading(std::string_view meter, std::string_view kind, std::string_view channel, std::pmr::memory_resource * mr = std::pmr::get_default_resource()) {
+        inline std::pmr::string publishEnergyReading(std::string_view meter,
+          std::string_view measurement,
+          std::string_view channel,
+          std::pmr::memory_resource * mr = std::pmr::get_default_resource()) {
             BOOST_ASSERT(mr);
             BOOST_ASSERT(meter.size());
             BOOST_ASSERT(kind.size());
             BOOST_ASSERT(channel == "total" || channel == "L1" || channel == "L2" || channel == "L3");
             using namespace std::string_view_literals;
-            return make_topic(*mr, "home"sv, "utilities"sv, "energy"sv, "electricity"sv, meter, kind, channel);
+            return _make_topic(mr, "energy"sv, "electricity"sv, meter, measurement, channel);
         }
-        
 
-    }
+    } // namespace utilities
 } // namespace topic
 
 } // namespace ranczo
diff --git a/services/CMakeLists.txt b/services/CMakeLists.txt
index 3dbde0c..4c32add 100644
--- a/services/CMakeLists.txt
+++ b/services/CMakeLists.txt
@@ -7,6 +7,6 @@ include(GNUInstallDirs)
 
 add_subdirectory(temperature_svc)
 add_subdirectory(floorheat_svc)
-# add_subdirectory(energymeter_svc)
+add_subdirectory(energymeter_svc)
 add_subdirectory(output_svc)
 add_subdirectory(input_svc)
diff --git a/services/energymeter_svc/ORNO_517.cpp b/services/energymeter_svc/ORNO_517.cpp
index e69de29..33ba019 100644
--- a/services/energymeter_svc/ORNO_517.cpp
+++ b/services/energymeter_svc/ORNO_517.cpp
@@ -0,0 +1,207 @@
+
+#include "ranczo-io/utils/date_utils.hpp"
+#include "ranczo-io/utils/modbus.hpp"
+#include <boost/asio/any_io_executor.hpp>
+#include <chrono>
+#include <cstdint>
+#include <modbus/modbus.h>
+
+namespace ranczo {
+
+// ───────────────────────────────────────────────────────────────────────────
+// Rejestry energomierza
+// ───────────────────────────────────────────────────────────────────────────
+
+struct Register {
+    const char * measurement_name;
+    const char * unit;
+    const char * register_name;
+    std::uint16_t offset; // offset w słowach 16-bit od _baseAddress
+
+    float (*read)(const std::uint16_t *);
+    float (*total)(float lhs, float rhs);
+
+    float do_read(const std::uint16_t * data) const {
+        return read(data + offset);
+    }
+};
+
+inline float read_float(const std::uint16_t * data) {
+    return modbus_get_float_abcd(data);
+}
+
+inline float from_kilo(const std::uint16_t * data) {
+    return read_float(data) * 1000.0f;
+}
+
+inline float add(float lhs, float rhs) {
+    return lhs + rhs;
+}
+
+inline float avg(float lhs, float rhs) {
+    return (lhs + rhs) * 0.5f;
+}
+
+// ───────────────────────────────────────────────────────────────────────────
+// Konkrety: odczyty "live"
+// ───────────────────────────────────────────────────────────────────────────
+
+class EnergymeterReadings {
+  public:
+    EnergymeterReadings(boost::asio::any_io_executor ex,
+      ModbusDevice & modbus,
+      std::span< const Register > regs,
+      const char * name,
+      std::uint16_t baseAddress)
+     : _ex(ex),
+       _modbus(modbus),
+       _registers(regs),
+       _name(name),
+       _baseAddress(baseAddress),
+       _housingUsage(regs.size(), 0.0f),
+       _heatingUsage(regs.size(), 0.0f) {}
+
+    // slave 1: "housing", slave 2: "heating"
+    ranczo::awaitable_expected< void > publish() {
+        using namespace std::chrono_literals;
+
+        const std::size_t LiveRegistersSize = _registers.size() * 2;
+
+        // std::vector< std::uint16_t > housingRaw(LiveRegistersSize);
+        // std::vector< std::uint16_t > heatingRaw(LiveRegistersSize);
+
+        // const auto housingTimepoint = date::to_iso_timestamp(std::chrono::system_clock::now());
+        // auto r1 =
+        //   co_await _modbus.async_read_holding_registers(_baseAddress, static_cast< std::uint16_t >(LiveRegistersSize), );
+        // if(!r1) {
+        //     spdlog::error("Modbus read (housing) failed: {}", r1.error().message());
+        //     co_return unexpected(r1.error());
+        // }
+
+        // const auto heatingTimepoint = date::to_iso_timestamp(std::chrono::system_clock::now());
+        // auto r2 =
+        //   co_await _modbus.read_holding_registers(2, _baseAddress, static_cast< std::uint16_t >(LiveRegistersSize), heatingRaw.data());
+        // if(!r2) {
+        //     spdlog::error("Modbus read (heating) failed: {}", r2.error().message());
+        //     co_return unexpected(r2.error());
+        // }
+
+        // const auto totalTimepoint = date::to_iso_timestamp(std::chrono::system_clock::now());
+
+        // auto housingPrev = _housingUsage.begin();
+        // auto heatingPrev = _heatingUsage.begin();
+
+        // for(const auto & reg : _registers) {
+        //     const float housingValue = reg.do_read(housingRaw.data());
+        //     const float heatingValue = reg.do_read(heatingRaw.data());
+        //     const float totalValue   = reg.total(heatingValue, housingValue);
+
+        //     const bool housingUpdated = housingValue != *housingPrev;
+        //     const bool heatingUpdated = heatingValue != *heatingPrev;
+        //     const bool totalUpdated   = housingUpdated || heatingUpdated;
+
+        //     *housingPrev = housingValue;
+        //     *heatingPrev = heatingValue;
+        //     ++housingPrev;
+        //     ++heatingPrev;
+        // }
+
+        co_return ranczo::expected< void >{};
+    }
+
+  protected:
+    boost::asio::any_io_executor _ex;
+    
+    ModbusDevice &_modbus;
+    std::span< const Register > _registers;
+    const char * _name;
+    const std::uint16_t _baseAddress;
+
+    std::vector< float > _housingUsage;
+    std::vector< float > _heatingUsage;
+};
+
+class EnergymeterLiveReading : public EnergymeterReadings {
+  private:
+    static constexpr std::uint16_t _baseAddressLive = 0x000E;
+
+    static constexpr Register liveRegisters_[] = {
+      {"Voltage", "V", "L1", std::uint16_t{0x000E} - _baseAddressLive, read_float, avg},
+      {"Voltage", "V", "L2", std::uint16_t{0x0010} - _baseAddressLive, read_float, avg},
+      {"Voltage", "V", "L3", std::uint16_t{0x0012} - _baseAddressLive, read_float, avg},
+      {"Frequency", "Hz", "Grid", std::uint16_t{0x0014} - _baseAddressLive, read_float, avg},
+      {"Current", "A", "L1", std::uint16_t{0x0016} - _baseAddressLive, read_float, add},
+      {"Current", "A", "L2", std::uint16_t{0x0018} - _baseAddressLive, read_float, add},
+      {"Current", "A", "L3", std::uint16_t{0x001A} - _baseAddressLive, read_float, add},
+      {"ActivePower", "W", "Total", std::uint16_t{0x001C} - _baseAddressLive, from_kilo, add},
+      {"ActivePower", "W", "L1", std::uint16_t{0x001E} - _baseAddressLive, from_kilo, add},
+      {"ActivePower", "W", "L2", std::uint16_t{0x0020} - _baseAddressLive, from_kilo, add},
+      {"ActivePower", "W", "L3", std::uint16_t{0x0022} - _baseAddressLive, from_kilo, add},
+      {"ReactivePower", "Var", "Total", std::uint16_t{0x0024} - _baseAddressLive, from_kilo, add},
+      {"ReactivePower", "Var", "L1", std::uint16_t{0x0026} - _baseAddressLive, from_kilo, add},
+      {"ReactivePower", "Var", "L2", std::uint16_t{0x0028} - _baseAddressLive, from_kilo, add},
+      {"ReactivePower", "Var", "L3", std::uint16_t{0x002A} - _baseAddressLive, from_kilo, add},
+      {"ApparentPower", "VA", "Total", std::uint16_t{0x002C} - _baseAddressLive, from_kilo, add},
+      {"ApparentPower", "VA", "L1", std::uint16_t{0x002E} - _baseAddressLive, from_kilo, add},
+      {"ApparentPower", "VA", "L2", std::uint16_t{0x0030} - _baseAddressLive, from_kilo, add},
+      {"ApparentPower", "VA", "L3", std::uint16_t{0x0032} - _baseAddressLive, from_kilo, add},
+      {"PowerFactor", "", "Total", std::uint16_t{0x0034} - _baseAddressLive, read_float, avg},
+      {"PowerFactor", "", "L1", std::uint16_t{0x0036} - _baseAddressLive, read_float, avg},
+      {"PowerFactor", "", "L2", std::uint16_t{0x0038} - _baseAddressLive, read_float, avg},
+      {"PowerFactor", "", "L3", std::uint16_t{0x003A} - _baseAddressLive, read_float, avg},
+    };
+
+  public:
+    EnergymeterLiveReading(boost::asio::any_io_executor ex, ModbusDevice & modbus)
+     : EnergymeterReadings(ex,
+         modbus,
+         std::span< const Register >(liveRegisters_, std::size(liveRegisters_)),
+         "current",
+         _baseAddressLive) {}
+};
+
+// ───────────────────────────────────────────────────────────────────────────
+// Konkrety: odczyty "total"
+// ───────────────────────────────────────────────────────────────────────────
+
+class EnergymeterTotalReading : public EnergymeterReadings {
+  private:
+    static constexpr std::uint16_t _baseAddressTotal = 0x0100;
+
+    static constexpr Register totalRegisters_[] = {
+      {"ActiveEnergy", "Wh", "Total", std::uint16_t{0x0100} - _baseAddressTotal, from_kilo, add},
+      {"ActiveEnergy", "Wh", "L1", std::uint16_t{0x0102} - _baseAddressTotal, from_kilo, add},
+      {"ActiveEnergy", "Wh", "L2", std::uint16_t{0x0104} - _baseAddressTotal, from_kilo, add},
+      {"ActiveEnergy", "Wh", "L3", std::uint16_t{0x0106} - _baseAddressTotal, from_kilo, add},
+      {"ForwardActiveEnergy", "Wh", "Total", std::uint16_t{0x0108} - _baseAddressTotal, from_kilo, add},
+      {"ForwardActiveEnergy", "Wh", "L1", std::uint16_t{0x010A} - _baseAddressTotal, from_kilo, add},
+      {"ForwardActiveEnergy", "Wh", "L2", std::uint16_t{0x010C} - _baseAddressTotal, from_kilo, add},
+      {"ForwardActiveEnergy", "Wh", "L3", std::uint16_t{0x010E} - _baseAddressTotal, from_kilo, add},
+      {"ReverseActiveEnergy", "Wh", "Total", std::uint16_t{0x0110} - _baseAddressTotal, from_kilo, add},
+      {"ReverseActiveEnergy", "Wh", "L1", std::uint16_t{0x0112} - _baseAddressTotal, from_kilo, add},
+      {"ReverseActiveEnergy", "Wh", "L2", std::uint16_t{0x0114} - _baseAddressTotal, from_kilo, add},
+      {"ReverseActiveEnergy", "Wh", "L3", std::uint16_t{0x0116} - _baseAddressTotal, from_kilo, add},
+      {"ReactiveEnergy", "Varh", "Total", std::uint16_t{0x0118} - _baseAddressTotal, from_kilo, add},
+      {"ReactiveEnergy", "Varh", "L1", std::uint16_t{0x011A} - _baseAddressTotal, from_kilo, add},
+      {"ReactiveEnergy", "Varh", "L2", std::uint16_t{0x011C} - _baseAddressTotal, from_kilo, add},
+      {"ReactiveEnergy", "Varh", "L3", std::uint16_t{0x011E} - _baseAddressTotal, from_kilo, add},
+      {"ForwardReactiveEnergy", "Varh", "Total", std::uint16_t{0x0120} - _baseAddressTotal, from_kilo, add},
+      {"ForwardReactiveEnergy", "Varh", "L1", std::uint16_t{0x0122} - _baseAddressTotal, from_kilo, add},
+      {"ForwardReactiveEnergy", "Varh", "L2", std::uint16_t{0x0124} - _baseAddressTotal, from_kilo, add},
+      {"ForwardReactiveEnergy", "Varh", "L3", std::uint16_t{0x0126} - _baseAddressTotal, from_kilo, add},
+      {"ReverseReactiveEnergy", "Varh", "Total", std::uint16_t{0x0128} - _baseAddressTotal, from_kilo, add},
+      {"ReverseReactiveEnergy", "Varh", "L1", std::uint16_t{0x012A} - _baseAddressTotal, from_kilo, add},
+      {"ReverseReactiveEnergy", "Varh", "L2", std::uint16_t{0x012C} - _baseAddressTotal, from_kilo, add},
+      {"ReverseReactiveEnergy", "Varh", "L3", std::uint16_t{0x012E} - _baseAddressTotal, from_kilo, add},
+    };
+
+  public:
+    EnergymeterTotalReading(boost::asio::any_io_executor ex, ModbusDevice & modbus)
+     : EnergymeterReadings(ex,
+         modbus,
+         std::span< const Register >(totalRegisters_, std::size(totalRegisters_)),
+         "total",
+         _baseAddressTotal) {}
+};
+
+} // namespace ranczo
diff --git a/services/energymeter_svc/ORNO_517.hpp b/services/energymeter_svc/ORNO_517.hpp
index e69de29..3f59c93 100644
--- a/services/energymeter_svc/ORNO_517.hpp
+++ b/services/energymeter_svc/ORNO_517.hpp
@@ -0,0 +1,2 @@
+#pragma once
+
diff --git a/services/energymeter_svc/main.cpp b/services/energymeter_svc/main.cpp
index a532548..ceba355 100644
--- a/services/energymeter_svc/main.cpp
+++ b/services/energymeter_svc/main.cpp
@@ -1,413 +1,40 @@
 
-#include <array>
-#include <chrono>
-#include <cstdint>
-#include <span>
-#include <string>
-#include <string_view>
-#include <vector>
-
 #include <boost/asio.hpp>
 #include <boost/system/error_code.hpp>
+
 #include <fmt/core.h>
-#include <modbus/modbus.h>
+#include <iostream>
+#include <memory_resource>
 #include <spdlog/spdlog.h>
 
 #include <config.hpp>
 
-// ───────────────────────────────────────────────────────────────────────────
-// Pomocnicze: timestamp ISO
-// ───────────────────────────────────────────────────────────────────────────
+#include <ranczo-io/utils/http.hpp>
 
-inline std::string to_iso_timestamp()
-{
-    using clock = std::chrono::system_clock;
-    auto now    = clock::now();
-    std::time_t t = clock::to_time_t(now);
-    
-    std::tm tm{};
-#if defined(_WIN32)
-    gmtime_s(&tm, &t);
-#else
-    gmtime_r(&t, &tm);
-#endif
-    
-    char buf[32];
-    std::strftime(buf, sizeof(buf), "%FT%TZ", &tm);
-    return std::string(buf);
+namespace ranczo {
+
+} // namespace ranczo
+
+int main() {
+    boost::asio::io_context io;
+
+    boost::asio::co_spawn(
+      io,
+      [&]() -> ranczo::awaitable< void > {
+          
+          ranczo::HttpGetClient cli{io.get_executor()};
+          auto r = co_await cli.async_get("http://192.168.20.11:80/state", std::pmr::get_default_resource());
+          
+          if(!r) {
+              spdlog::error("HTTP GET failed: {}", r.error().message());
+          } else {
+              std::cout << *r;
+              // spdlog::info("Response: {}", *r);
+          }
+
+          co_return;
+      },
+      boost::asio::detached);
+
+    io.run();
 }
-
-// ───────────────────────────────────────────────────────────────────────────
-// Rejestry energomierza
-// ───────────────────────────────────────────────────────────────────────────
-
-struct Register {
-    const char*   measurement_name;
-    const char*   unit;
-    const char*   register_name;
-    std::uint16_t offset;  // offset w słowach 16-bit od _baseAddress
-    
-    float (*read)(const std::uint16_t*);
-    float (*total)(float lhs, float rhs);
-    
-    float do_read(const std::uint16_t* data) const {
-        return read(data + offset);
-    }
-};
-
-inline float read_float(const std::uint16_t* data) {
-    return modbus_get_float_abcd(data);
-}
-
-inline float from_kilo(const std::uint16_t* data) {
-    return read_float(data) * 1000.0f;
-}
-
-inline float add(float lhs, float rhs) {
-    return lhs + rhs;
-}
-
-inline float avg(float lhs, float rhs) {
-    return (lhs + rhs) * 0.5f;
-}
-
-// ───────────────────────────────────────────────────────────────────────────
-// Formatowanie topiców / payloadów MQTT
-// ───────────────────────────────────────────────────────────────────────────
-
-inline std::size_t topic_to(
-  char* buffer,
-  const Register& reg,
-  std::string_view type,
-  std::string_view event)
-{
-    const auto end = fmt::format_to(
-      buffer,
-      "home/utilities/electricity/{}/{}/{}/{}",
-      type,
-      event,
-      reg.measurement_name,
-      reg.register_name);
-    
-    *end = '\0';
-    auto len = static_cast<std::size_t>(std::distance(buffer, end) + 1);
-    spdlog::debug("MQTT topic: {}", buffer);
-    return len;
-}
-
-inline std::size_t payload_to(
-  std::uint8_t* buffer,
-  const Register& reg,
-  float value,
-  bool update,
-  std::string_view ts)
-{
-    const auto end = fmt::format_to(
-      buffer,
-      R"json({{"value":{},"unit":"{}","source":"energymeter_service","update":{},"timestamp":"{}"}})json",
-      value,
-      reg.unit,
-      update ? "true" : "false",
-      ts);
-    
-    auto len = static_cast<std::size_t>(std::distance(buffer, end));
-    return len;
-}
-
-// ───────────────────────────────────────────────────────────────────────────
-// Bazowa klasa odczytu energomierza (async, z boost::asio)
-// ───────────────────────────────────────────────────────────────────────────
-
-class EnergymeterReadings {
-  public:
-    EnergymeterReadings(
-      boost::asio::any_io_executor ex,
-      MqttClient& mqtt,
-      ModbusClient& modbus,
-      std::span<const Register> regs,
-      const char* name,
-      std::uint16_t baseAddress)
-     : _ex(ex)
-       , _mqtt(mqtt)
-       , _modbus(modbus)
-       , _registers(regs)
-       , _name(name)
-       , _baseAddress(baseAddress)
-       , _housingUsage(regs.size(), 0.0f)
-       , _heatingUsage(regs.size(), 0.0f)
-    {}
-    
-           // slave 1: "housing", slave 2: "heating"
-    awaitable_expected<void> publish()
-    {
-        using namespace std::chrono_literals;
-        
-        const std::size_t LiveRegistersSize = _registers.size() * 2;
-        
-        std::vector<std::uint16_t> housingRaw(LiveRegistersSize);
-        std::vector<std::uint16_t> heatingRaw(LiveRegistersSize);
-        
-        const auto housingTimepoint = to_iso_timestamp();
-        auto r1 = co_await _modbus.read_holding_registers(
-          1, _baseAddress, static_cast<std::uint16_t>(LiveRegistersSize), housingRaw.data());
-        if (!r1) {
-            spdlog::error("Modbus read (housing) failed: {}", r1.error().message());
-            co_return unexpected(r1.error());
-        }
-        
-        const auto heatingTimepoint = to_iso_timestamp();
-        auto r2 = co_await _modbus.read_holding_registers(
-          2, _baseAddress, static_cast<std::uint16_t>(LiveRegistersSize), heatingRaw.data());
-        if (!r2) {
-            spdlog::error("Modbus read (heating) failed: {}", r2.error().message());
-            co_return unexpected(r2.error());
-        }
-        
-        const auto totalTimepoint = to_iso_timestamp();
-        
-        auto housingPrev = _housingUsage.begin();
-        auto heatingPrev = _heatingUsage.begin();
-        
-        std::uint8_t payloadBuffer[256];
-        char topicBuffer[256];
-        
-        for (const auto& reg : _registers) {
-            const float housingValue = reg.do_read(housingRaw.data());
-            const float heatingValue = reg.do_read(heatingRaw.data());
-            const float totalValue   = reg.total(heatingValue, housingValue);
-            
-            const bool housingUpdated = housingValue != *housingPrev;
-            const bool heatingUpdated = heatingValue != *heatingPrev;
-            const bool totalUpdated   = housingUpdated || heatingUpdated;
-            
-            *housingPrev = housingValue;
-            *heatingPrev = heatingValue;
-            ++housingPrev;
-            ++heatingPrev;
-            
-            auto doPublish = [&](float value,
-                               bool updated,
-                               std::string_view ts,
-                               const char* type) -> awaitable_expected<void>
-            {
-                const std::size_t topicLen = topic_to(topicBuffer, reg, _name, type);
-                const std::size_t payloadLen = payload_to(
-                  payloadBuffer, reg, value, updated, ts);
-                
-                std::string_view topic(topicBuffer, topicLen - 1); // bez '\0'
-                std::string_view payload(
-                  reinterpret_cast<const char*>(payloadBuffer),
-                  payloadLen);
-                
-                auto res = co_await _mqtt.publish(topic, payload, 0);
-                if (!res) {
-                    spdlog::warn("MQTT publish failed on topic {}: {}",
-                      topic, res.error().message());
-                    co_return unexpected(res.error());
-                }
-                
-                co_return expected<void>{};
-            };
-            
-                   // housing
-            (void) co_await doPublish(housingValue, housingUpdated, housingTimepoint, "housing");
-            // heating
-            (void) co_await doPublish(heatingValue, heatingUpdated, heatingTimepoint, "heating");
-            // total
-            (void) co_await doPublish(totalValue, totalUpdated, totalTimepoint, "ALL");
-        }
-        
-        co_return expected<void>{};
-    }
-    
-  protected:
-    boost::asio::any_io_executor _ex;
-    MqttClient&                  _mqtt;
-    ModbusClient&                _modbus;
-    
-    std::span<const Register> _registers;
-    const char*               _name;
-    const std::uint16_t       _baseAddress;
-    
-    std::vector<float> _housingUsage;
-    std::vector<float> _heatingUsage;
-};
-
-// ───────────────────────────────────────────────────────────────────────────
-// Konkrety: odczyty "live"
-// ───────────────────────────────────────────────────────────────────────────
-
-class EnergymeterLiveReading : public EnergymeterReadings {
-  private:
-    static constexpr std::uint16_t _baseAddressLive = 0x000E;
-    
-    static constexpr Register liveRegisters_[] = {
-      {"Voltage", "V", "L1", std::uint16_t{0x000E} - _baseAddressLive, read_float, avg},
-      {"Voltage", "V", "L2", std::uint16_t{0x0010} - _baseAddressLive, read_float, avg},
-      {"Voltage", "V", "L3", std::uint16_t{0x0012} - _baseAddressLive, read_float, avg},
-      {"Frequency", "Hz", "Grid", std::uint16_t{0x0014} - _baseAddressLive, read_float, avg},
-      {"Current", "A", "L1", std::uint16_t{0x0016} - _baseAddressLive, read_float, add},
-      {"Current", "A", "L2", std::uint16_t{0x0018} - _baseAddressLive, read_float, add},
-      {"Current", "A", "L3", std::uint16_t{0x001A} - _baseAddressLive, read_float, add},
-      {"ActivePower", "W", "Total", std::uint16_t{0x001C} - _baseAddressLive, from_kilo, add},
-      {"ActivePower", "W", "L1", std::uint16_t{0x001E} - _baseAddressLive, from_kilo, add},
-      {"ActivePower", "W", "L2", std::uint16_t{0x0020} - _baseAddressLive, from_kilo, add},
-      {"ActivePower", "W", "L3", std::uint16_t{0x0022} - _baseAddressLive, from_kilo, add},
-      {"ReactivePower", "Var", "Total", std::uint16_t{0x0024} - _baseAddressLive, from_kilo, add},
-      {"ReactivePower", "Var", "L1", std::uint16_t{0x0026} - _baseAddressLive, from_kilo, add},
-      {"ReactivePower", "Var", "L2", std::uint16_t{0x0028} - _baseAddressLive, from_kilo, add},
-      {"ReactivePower", "Var", "L3", std::uint16_t{0x002A} - _baseAddressLive, from_kilo, add},
-      {"ApparentPower", "VA", "Total", std::uint16_t{0x002C} - _baseAddressLive, from_kilo, add},
-      {"ApparentPower", "VA", "L1", std::uint16_t{0x002E} - _baseAddressLive, from_kilo, add},
-      {"ApparentPower", "VA", "L2", std::uint16_t{0x0030} - _baseAddressLive, from_kilo, add},
-      {"ApparentPower", "VA", "L3", std::uint16_t{0x0032} - _baseAddressLive, from_kilo, add},
-      {"PowerFactor", "", "Total", std::uint16_t{0x0034} - _baseAddressLive, read_float, avg},
-      {"PowerFactor", "", "L1", std::uint16_t{0x0036} - _baseAddressLive, read_float, avg},
-      {"PowerFactor", "", "L2", std::uint16_t{0x0038} - _baseAddressLive, read_float, avg},
-      {"PowerFactor", "", "L3", std::uint16_t{0x003A} - _baseAddressLive, read_float, avg},
-      };
-    
-  public:
-    EnergymeterLiveReading(
-      boost::asio::any_io_executor ex,
-      MqttClient& mqtt,
-      ModbusClient& modbus)
-     : EnergymeterReadings(
-         ex,
-         mqtt,
-         modbus,
-         std::span<const Register>(liveRegisters_, std::size(liveRegisters_)),
-         "current",
-         _baseAddressLive)
-    {}
-};
-
-// ───────────────────────────────────────────────────────────────────────────
-// Konkrety: odczyty "total"
-// ───────────────────────────────────────────────────────────────────────────
-
-class EnergymeterTotalReading : public EnergymeterReadings {
-  private:
-    static constexpr std::uint16_t _baseAddressTotal = 0x0100;
-    
-    static constexpr Register totalRegisters_[] = {
-      {"ActiveEnergy", "Wh", "Total", std::uint16_t{0x0100} - _baseAddressTotal, from_kilo, add},
-      {"ActiveEnergy", "Wh", "L1", std::uint16_t{0x0102} - _baseAddressTotal, from_kilo, add},
-      {"ActiveEnergy", "Wh", "L2", std::uint16_t{0x0104} - _baseAddressTotal, from_kilo, add},
-      {"ActiveEnergy", "Wh", "L3", std::uint16_t{0x0106} - _baseAddressTotal, from_kilo, add},
-      {"ForwardActiveEnergy", "Wh", "Total", std::uint16_t{0x0108} - _baseAddressTotal, from_kilo, add},
-      {"ForwardActiveEnergy", "Wh", "L1", std::uint16_t{0x010A} - _baseAddressTotal, from_kilo, add},
-      {"ForwardActiveEnergy", "Wh", "L2", std::uint16_t{0x010C} - _baseAddressTotal, from_kilo, add},
-      {"ForwardActiveEnergy", "Wh", "L3", std::uint16_t{0x010E} - _baseAddressTotal, from_kilo, add},
-      {"ReverseActiveEnergy", "Wh", "Total", std::uint16_t{0x0110} - _baseAddressTotal, from_kilo, add},
-      {"ReverseActiveEnergy", "Wh", "L1", std::uint16_t{0x0112} - _baseAddressTotal, from_kilo, add},
-      {"ReverseActiveEnergy", "Wh", "L2", std::uint16_t{0x0114} - _baseAddressTotal, from_kilo, add},
-      {"ReverseActiveEnergy", "Wh", "L3", std::uint16_t{0x0116} - _baseAddressTotal, from_kilo, add},
-      {"ReactiveEnergy", "Varh", "Total", std::uint16_t{0x0118} - _baseAddressTotal, from_kilo, add},
-      {"ReactiveEnergy", "Varh", "L1", std::uint16_t{0x011A} - _baseAddressTotal, from_kilo, add},
-      {"ReactiveEnergy", "Varh", "L2", std::uint16_t{0x011C} - _baseAddressTotal, from_kilo, add},
-      {"ReactiveEnergy", "Varh", "L3", std::uint16_t{0x011E} - _baseAddressTotal, from_kilo, add},
-      {"ForwardReactiveEnergy", "Varh", "Total", std::uint16_t{0x0120} - _baseAddressTotal, from_kilo, add},
-      {"ForwardReactiveEnergy", "Varh", "L1", std::uint16_t{0x0122} - _baseAddressTotal, from_kilo, add},
-      {"ForwardReactiveEnergy", "Varh", "L2", std::uint16_t{0x0124} - _baseAddressTotal, from_kilo, add},
-      {"ForwardReactiveEnergy", "Varh", "L3", std::uint16_t{0x0126} - _baseAddressTotal, from_kilo, add},
-      {"ReverseReactiveEnergy", "Varh", "Total", std::uint16_t{0x0128} - _baseAddressTotal, from_kilo, add},
-      {"ReverseReactiveEnergy", "Varh", "L1", std::uint16_t{0x012A} - _baseAddressTotal, from_kilo, add},
-      {"ReverseReactiveEnergy", "Varh", "L2", std::uint16_t{0x012C} - _baseAddressTotal, from_kilo, add},
-      {"ReverseReactiveEnergy", "Varh", "L3", std::uint16_t{0x012E} - _baseAddressTotal, from_kilo, add},
-      };
-    
-  public:
-    EnergymeterTotalReading(
-      boost::asio::any_io_executor ex,
-      MqttClient& mqtt,
-      ModbusClient& modbus)
-     : EnergymeterReadings(
-         ex,
-         mqtt,
-         modbus,
-         std::span<const Register>(totalRegisters_, std::size(totalRegisters_)),
-         "total",
-         _baseAddressTotal)
-    {}
-};
-
-// ───────────────────────────────────────────────────────────────────────────
-// Serwis: dwa taski asynchroniczne (live + total) na timerach
-// ───────────────────────────────────────────────────────────────────────────
-
-class EnergymeterService {
-  public:
-    EnergymeterService(
-      boost::asio::any_io_executor ex,
-      MqttClient& mqtt,
-      ModbusClient& modbus)
-     : _ex(ex)
-       , _live(ex, mqtt, modbus)
-       , _total(ex, mqtt, modbus)
-    {}
-    
-           // uruchamia oba taski; wołaj np. przez co_spawn(service.run(), detached)
-    awaitable<void> run()
-    {
-        using boost::asio::co_spawn;
-        using boost::asio::detached;
-        
-        co_spawn(_ex,
-          [this]() -> awaitable<void> {
-              co_await live_loop();
-          },
-          detached);
-        
-        co_spawn(_ex,
-          [this]() -> awaitable<void> {
-              co_await total_loop();
-          },
-          detached);
-        
-        co_return;
-    }
-    
-  private:
-    awaitable<void> live_loop()
-    {
-        using namespace std::chrono_literals;
-        boost::asio::steady_timer timer(_ex);
-        
-        while (true) {
-            timer.expires_after(3s);
-            boost::system::error_code ec;
-            co_await timer.async_wait(boost::asio::redirect_error(boost::asio::use_awaitable, ec));
-            if (ec == boost::asio::error::operation_aborted)
-                co_return;
-            
-            auto res = co_await _live.publish();
-            if (!res) {
-                spdlog::warn("Live reading publish error: {}", res.error().message());
-            }
-        }
-    }
-    
-    awaitable<void> total_loop()
-    {
-        using namespace std::chrono_literals;
-        boost::asio::steady_timer timer(_ex);
-        
-        while (true) {
-            timer.expires_after(60s);
-            boost::system::error_code ec;
-            co_await timer.async_wait(boost::asio::redirect_error(boost::asio::use_awaitable, ec));
-            if (ec == boost::asio::error::operation_aborted)
-                co_return;
-            
-            auto res = co_await _total.publish();
-            if (!res) {
-                spdlog::warn("Total reading publish error: {}", res.error().message());
-            }
-        }
-    }
-    
-    boost::asio::any_io_executor _ex;
-    EnergymeterLiveReading       _live;
-    EnergymeterTotalReading      _total;
-};
diff --git a/services/floorheat_svc/CMakeLists.txt b/services/floorheat_svc/CMakeLists.txt
index 56e677d..af5bee8 100644
--- a/services/floorheat_svc/CMakeLists.txt
+++ b/services/floorheat_svc/CMakeLists.txt
@@ -1,8 +1,9 @@
 add_executable(ranczo-io_floorheating
     main.cpp
-    temperature_controller.hpp  temperature_controller.cpp 
-    relay.hpp                   relay.cpp
-    thermometer.hpp             thermometer.cpp
+    temperature_controller.hpp   temperature_controller.cpp 
+    temperature_measurements.hpp temperature_measurements.cpp
+    relay.hpp                    relay.cpp
+    thermometer.hpp              thermometer.cpp
     
     ranczo-io_floorheating.service.in
     postinst
diff --git a/services/floorheat_svc/main.cpp b/services/floorheat_svc/main.cpp
index e94a053..f144fc9 100644
--- a/services/floorheat_svc/main.cpp
+++ b/services/floorheat_svc/main.cpp
@@ -40,6 +40,20 @@ namespace ranczo {
 ///  * Zapis danych w DB
 ///  * Zapis ustawień
 ///  * Nasłuchiwanie na MQTT
+/// static constexpr std::array< std::tuple< int, quantity< Resistance >, Line >, 8 > _idToResistance{
+//  std::tuple{4, 38.9915503757583 * boost::units::si::ohm, Line::L1},
+//  std::tuple{5, 116.973061767177 * boost::units::si::ohm, Line::L1},
+//   std::tuple{25, 38.1843638931974 * boost::units::si::ohm, Line::L2}, // 2/9  playroom
+//   std::tuple{26, 49.9384951729712 * boost::units::si::ohm, Line::L3}, // 2/10 aska
+//   std::tuple{27, 50.8739911417796 * boost::units::si::ohm, Line::L3}, // 2/11 maciej
+//   std::tuple{28, 76.6462545974082 * boost::units::si::ohm, Line::L2}, // 2/12 office
+//   std::tuple{29, 94.2874894960184 * boost::units::si::ohm, Line::L1}, // 2/13 bathroom 3 
+//   std::tuple{49, 38.9915503757583 * boost::units::si::ohm, Line::L1}};// 16/1 utility
+// 16/11 bathroom_1
+
+// TODO subscribe to home/utilities/power/electricity/main/active/[L1|L2|L3] and listen to energy usage, disable some mats when energy usage is too high
+// TODO subscribe to home/utilities/powerline/electricity/main/voltage/L1 and listen to energy usage, disable some mats when energy usage is too high
+// TODO Procedure to check the 
 
 } // namespace ranczo
 
@@ -272,4 +286,3 @@ int main() {
 
     return 0;
 }
-
diff --git a/services/floorheat_svc/temperature_controller.cpp b/services/floorheat_svc/temperature_controller.cpp
index 5c7e5ff..8f4353c 100644
--- a/services/floorheat_svc/temperature_controller.cpp
+++ b/services/floorheat_svc/temperature_controller.cpp
@@ -10,7 +10,6 @@
 #include <boost/asio/experimental/parallel_group.hpp>
 #include <boost/asio/redirect_error.hpp>
 #include <boost/asio/steady_timer.hpp>
-#include <boost/circular_buffer.hpp>
 #include <boost/core/noncopyable.hpp>
 #include <boost/json/object.hpp>
 #include <boost/json/storage_ptr.hpp>
@@ -32,6 +31,9 @@
 #include <ranczo-io/utils/memory_resource.hpp>
 #include <ranczo-io/utils/mqtt_client.hpp>
 #include <ranczo-io/utils/mqtt_topic_builder.hpp>
+#include <services/floorheat_svc/temperature_measurements.hpp>
+
+#include <boost/units/systems/si/resistance.hpp>
 
 #include <string>
 #include <string_view>
@@ -41,10 +43,6 @@
 
 namespace ranczo {
 
-template<typename T>
-std::optional<T> from_string(std::optional< std::string_view > state,
-  std::pmr::memory_resource * mr = std::pmr::get_default_resource());
-
 enum class ThermostatState { Enabled, Disabled, Error };
 std::string to_string(ThermostatState state) {
     switch(state) {
@@ -57,17 +55,16 @@ std::string to_string(ThermostatState state) {
     }
 }
 
-template<>
-std::optional< ThermostatState > from_string(std::optional< std::string_view > state,
-  std::pmr::memory_resource * mr) {
+template <>
+std::optional< ThermostatState > from_string(std::optional< std::string_view > state, std::pmr::memory_resource * mr) {
     BOOST_ASSERT(mr);
-    
+
     if(not state) {
         return std::nullopt;
     }
     std::pmr::string s(state->begin(), state->end(), mr);
     std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return static_cast< char >(std::tolower(c)); });
-    
+
     if(s == "enabled")
         return ThermostatState::Enabled;
     if(s == "disabled")
@@ -77,38 +74,6 @@ std::optional< ThermostatState > from_string(std::optional< std::string_view > s
     return std::nullopt;
 }
 
-enum class Trend { Fall, Const, Rise };
-
-std::pmr::string to_string(Trend state) {
-    switch(state) {
-        case Trend::Fall:
-            return "Fall";
-        case Trend::Const:
-            return "Const";
-        default:
-            return "Rise";
-    }
-}
-template <  >
-std::optional< Trend > from_string(std::optional< std::string_view > state,
-  std::pmr::memory_resource * mr) {
-    BOOST_ASSERT(mr);
-    
-    if(not state) {
-        return std::nullopt;
-    }
-    std::pmr::string s(state->begin(), state->end(), mr);
-    std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return static_cast< char >(std::tolower(c)); });
-    
-    if(s == "fall")
-        return Trend::Fall;
-    if(s == "const")
-        return Trend::Const;
-    if(s == "rise")
-        return Trend::Rise;
-    return std::nullopt;
-}
-
 template < typename T >
 inline expected< T > readValue(const boost::json::value & jv, std::string_view key) {
     if(auto * obj = jv.if_object()) {
@@ -121,7 +86,7 @@ inline expected< T > readValue(const boost::json::value & jv, std::string_view k
                 if(!pv->is_string()) {
                     return unexpected{make_error_code(boost::system::errc::invalid_argument)};
                 }
-                auto v = from_string<T>(std::make_optional< std::string >(pv->as_string()));
+                auto v = from_string< T >(std::make_optional< std::string >(pv->as_string()));
                 if(not v)
                     return unexpected{make_error_code(boost::system::errc::invalid_argument)};
                 return *v;
@@ -247,173 +212,6 @@ namespace commands {
     };
 } // namespace commands
 
-/**
- * @brief The ThermometerMeasurements class. It listens to thermometer async temperature update and stores those as a linear history
- * @todo We can read the history of measurements from PG database that stores them,
- *          optional as we will not reload this service often so we can store our own  measurements for couple of minutes
- */
-struct ThermometerMeasurements {
-    struct Measurement {
-        std::chrono::system_clock::time_point when;
-        Thermometer::ThermometerData data;
-    };
-    executor & _io;
-    ModuleLogger _log;
-    std::unique_ptr< Thermometer > _sensor;
-    boost::circular_buffer< Measurement > _history;
-
-    ThermometerMeasurements(executor & io, std::unique_ptr< Thermometer > sensor)
-     : _io{io}, _log{spdlog::default_logger(), "ThermometerMeasurements"}, _sensor{std::move(sensor)}, _history{200} {}
-
-    /**
-     * @brief start the service, we can't make it happen in ctor so we need a different approach
-     * @return
-     */
-    awaitable_expected< void > subscribeToTemperatureUpdate() {
-        return _sensor->on_update([&](auto data) { return this->temperatureUpdateCallback(data); });
-    }
-
-    awaitable_expected< void > temperatureUpdateCallback(Thermometer::ThermometerData data) {
-        // circular buffer, no need to clean
-        _log.debug("Got new sample: {} total: {}", data.temp_c(), _history.size());
-        /// TODO thermometer sometimes gives a temp like 80C which is a fluck, we need to filter this
-        _history.push_back({std::chrono::system_clock::now(), data});
-        co_return _void{};
-    }
-
-    awaitable_expected< void > start() {
-        BOOST_ASSERT(_sensor);
-
-        // subscribe to a thermometer readings
-        ASYNC_CHECK_LOG(subscribeToTemperatureUpdate(), "subscribtion to temperature stream failed");
-
-        // spins own mqtt listener 'thread' and executes on update callback on every temperature update
-        boost::asio::co_spawn(_io, _sensor->listen(), boost::asio::detached);
-        co_return _void{};
-    }
-
-    /**
-     * @brief timeSinceLastRead
-     * @return a time that passed since last temperature read or nullopt if no measurements are available
-     */
-    std::optional< std::chrono::nanoseconds > timeSinceLastRead() const noexcept {
-        if(_history.size() == 0)
-            return std::nullopt;
-
-        auto timeDiff = std::chrono::system_clock::now() - _history.back().when;
-
-        if(timeDiff < std::chrono::nanoseconds{0}) {
-            memory_resource::MonotonicStackResource< 64 > mr;
-            auto now_ts  = date::to_iso_timestamp(std::chrono::system_clock::now(), &mr);
-            auto meas_ts = date::to_iso_timestamp(_history.back().when, &mr);
-            _log.warn("measurements are from the future (measurement: {}, now: {})", meas_ts, now_ts);
-        }
-
-        return timeDiff;
-    }
-
-    /**
-     * @brief currentTemperature
-     * @return temperature or nothing if no temp is yet available
-     */
-    std::optional< double > currentTemperature() const noexcept {
-        if(auto last = timeSinceLastRead(); not last.has_value()) {
-            return std::nullopt;
-        }
-        return _history.back().data.temp_c();
-    }
-
-    std::size_t size() const noexcept {
-        return _history.size();
-    }
-    /**
-     * @brief temperatureTrend
-     * @param window which should be used to get the trend
-     * @param epsilon_deg_per_min, trend specyfier
-     * @return a trend if trent can be calculated or nullopt
-     */
-    std::optional< Trend > temperatureTrend(std::chrono::nanoseconds window = std::chrono::minutes(5),
-      double epsilon_deg_per_min                                            = 0.2) const {
-        if(auto last = timeSinceLastRead(); not last.has_value()) {
-            _log.debug("No temperature samples available");
-            return std::nullopt;
-        }
-
-        if(_history.size() < 2) {
-            _log.debug("Too few samples in the last {} minutes, no trend can be calculated",
-              std::chrono::duration_cast< std::chrono::duration< double, std::ratio< 60 > > >(window).count());
-            return Trend::Const;
-        }
-
-        const auto now          = std::chrono::system_clock::now();
-        const auto window_start = now - window;
-
-        struct Point {
-            double t_s;
-            double temp;
-            std::chrono::system_clock::time_point when;
-        };
-        std::vector< Point > pts;
-        pts.reserve(_history.size());
-
-        for(const auto & m : _history) {
-            if(m.when < window_start || m.when > now)
-                continue;
-
-            double t_s = std::chrono::duration< double >(m.when - window_start).count();
-            double y   = m.data.temp_c();
-            pts.push_back({t_s, y, m.when});
-        }
-
-        if(pts.size() < 2) {
-            _log.debug("Too few samples in the last {} minutes, no trend can be calculated",
-              std::chrono::duration_cast< std::chrono::duration< double, std::ratio< 60 > > >(window).count());
-            return Trend::Const;
-        }
-
-        // Posortuj czasowo (przyda się w fallbacku)
-        std::sort(pts.begin(), pts.end(), [](const Point & a, const Point & b) { return a.when < b.when; });
-        // Regresja liniowa y = a + b * t
-        double sum_t{};
-        double sum_y{};
-        double sum_tt{};
-        double sum_ty{};
-        for(const auto & p : pts) {
-            sum_t += p.t_s;
-            sum_y += p.temp;
-            sum_tt += p.t_s * p.t_s;
-            sum_ty += p.t_s * p.temp;
-        }
-
-        const double n     = static_cast< double >(pts.size());
-        const double denom = (n * sum_tt - sum_t * sum_t);
-
-        double slope_deg_per_s = 0.0;
-        if(denom != 0.0) {
-            slope_deg_per_s = (n * sum_ty - sum_t * sum_y) / denom; // b
-        } else {
-            // fallback: pochylona między pierwszą i ostatnią próbką
-            const double dt_s = std::chrono::duration< double >(pts.back().when - pts.front().when).count();
-            if(dt_s <= 0.0) {
-                _log.warn("No time spread in samples (dt = {}).", dt_s);
-                return Trend::Const;
-            }
-            slope_deg_per_s = (pts.back().temp - pts.front().temp) / dt_s;
-        }
-
-        const double slope_deg_per_min = slope_deg_per_s * 60.0;
-
-        _log.debug(
-          "Trend (5 min): samples={}, slope={:.4f} °C/min, threshold={:.4f} °C/min", pts.size(), slope_deg_per_min, epsilon_deg_per_min);
-
-        if(slope_deg_per_min > epsilon_deg_per_min)
-            return Trend::Rise;
-        if(slope_deg_per_min < -epsilon_deg_per_min)
-            return Trend::Fall;
-        return Trend::Const;
-    }
-};
-
 enum RuntimeError {
     NoTemperatureMeasurements = 1,
     IoError,
@@ -509,6 +307,9 @@ struct RelayThermostat::Impl : private boost::noncopyable {
     double _slopeDT_c{0.2};                                           // [°C / min]
     std::chrono::nanoseconds _sensorTimeout{std::chrono::minutes(5)}; // max time to wait for temperature
 
+    /// TODO dodanie resistance
+    ///
+
     // additional variables
     Timer _statusTimer;                             // sends status of current endpoint
     std::chrono::system_clock::time_point _startTP; // used only to prevent warnings at start of procedure
@@ -799,15 +600,15 @@ struct RelayThermostat::Impl : private boost::noncopyable {
 
     awaitable_expected< void > handleErrorState() {
         /// check preconditions, if ok release error state
-        
+
         auto preconditionsMet = ASYNC_TRY(preconditions());
-        
+
         if(!preconditionsMet) {
             // dalej coś jest nie tak -> upewnij się, że grzanie jest OFF
             ASYNC_CHECK(safe_off());
             co_return _void{};
         }
-        
+
         if(_panic) {
             if(_panic_severity == PanicSeverity::Danger) {
                 _log.warn("ErrorState: preconditions met but PANIC(Danger) active – staying in ERROR");
@@ -823,7 +624,7 @@ struct RelayThermostat::Impl : private boost::noncopyable {
         } else {
             _log.info("ErrorState: preconditions met – switching back to Enabled");
         }
-        
+
         _state = ThermostatState::Enabled;
         co_return _void{};
     }
@@ -839,7 +640,7 @@ struct RelayThermostat::Impl : private boost::noncopyable {
 
     awaitable_expected< void > handleEnabledState() {
         using namespace std::chrono;
-        
+
         if(_panic) {
             _log.error("handleEnabledState called while PANIC is active – forcing ERROR");
             _state = ThermostatState::Error;
@@ -997,8 +798,7 @@ struct RelayThermostat::Impl : private boost::noncopyable {
 
         auto toSec = [](auto t) { return seconds{t}.count(); };
 
-        _state = from_string<ThermostatState>(
-          co_await _settings.async_get_store_default("state", to_string(ThermostatState::Disabled)))
+        _state = from_string< ThermostatState >(co_await _settings.async_get_store_default("state", to_string(ThermostatState::Disabled)))
                    .value_or(ThermostatState::Disabled);
 
         _targetTemperature = co_await _settings.async_get_store_default("target_temperature", 20.0);
@@ -1007,6 +807,7 @@ struct RelayThermostat::Impl : private boost::noncopyable {
         _slopeWindow       = seconds{co_await _settings.async_get_store_default("slope_window_s", toSec(minutes{1}))};
         _slopeDT_c         = co_await _settings.async_get_store_default("slope_delta_t", 1); // [°C / min]
         _sensorTimeout     = seconds{co_await _settings.async_get_store_default("sensor_timeout_s", toSec(minutes{5}))};
+        /// TODO sprawdzić czy inne parametry również trzeba/można odczytać
 
         // subscribe to a thermostat commands feed
         _log.info("Start: subscribe to mqtt");
@@ -1051,14 +852,14 @@ struct RelayThermostat::Impl : private boost::noncopyable {
         // broadcast: zone 0
         const auto broadcast_topic = topic::heating::subscribeToControl(_room, 0, Command::topic_suffix);
         // konkretna strefa:
-        const auto zone_topic = topic::heating::subscribeToControl(_room, _zone, Command::topic_suffix) ;
+        const auto zone_topic = topic::heating::subscribeToControl(_room, _zone, Command::topic_suffix);
 
         auto cb = [this](const AsyncMqttClient::CallbackData & data, AsyncMqttClient::ResponseData & resp) -> awaitable_expected< void > {
             auto _result = Command::from_payload(data.request);
             if(!_result)
-                co_return unexpected{_result.error()}; // 
+                co_return unexpected{_result.error()}; //
 
-            auto cmd = *_result;
+            auto cmd      = *_result;
             auto expected = co_await handle_command(cmd);
             if(expected) {
                 if(resp.has_value()) {
@@ -1162,9 +963,9 @@ struct RelayThermostat::Impl : private boost::noncopyable {
         _panic_severity    = PanicSeverity::Safe;
         _panic_since       = std::nullopt;
         _last_error_reason = "";
-        
+
         _log.info("Going to safe state after clear panic");
-         _state = ThermostatState::Disabled;
+        _state = ThermostatState::Disabled;
         co_return true;
     }
 
@@ -1195,7 +996,7 @@ struct RelayThermostat::Impl : private boost::noncopyable {
 
         auto trend = _thermo.temperatureTrend(_slopeWindow, _slopeDT_c);
         if(trend) {
-            obj["current_trend"] = to_string(*trend);
+            obj["temperature_trend"] = to_string(*trend);
         }
         obj["measurements_size"] = _thermo.size();
         obj["hysteresis"]        = _hysteresis;
diff --git a/services/floorheat_svc/temperature_measurements.cpp b/services/floorheat_svc/temperature_measurements.cpp
new file mode 100644
index 0000000..73c3a68
--- /dev/null
+++ b/services/floorheat_svc/temperature_measurements.cpp
@@ -0,0 +1,133 @@
+#include "temperature_measurements.hpp"
+#include "ranczo-io/utils/date_utils.hpp"
+#include <boost/asio/co_spawn.hpp>
+#include <boost/asio/detached.hpp>
+
+namespace ranczo {
+
+ThermometerMeasurements::ThermometerMeasurements(executor & io, std::unique_ptr< Thermometer > sensor)
+ : _io{io}, _log{spdlog::default_logger(), "ThermometerMeasurements"}, _sensor{std::move(sensor)}, _history{200} {}
+
+awaitable_expected< void > ThermometerMeasurements::temperatureUpdateCallback(Thermometer::ThermometerData data) {
+    // circular buffer, no need to clean
+    _log.debug("Got new sample: {} total: {}", data.temp_c(), _history.size());
+    /// TODO thermometer sometimes gives a temp like 80C which is a fluck, we need to filter this
+    _history.push_back({std::chrono::system_clock::now(), data});
+    co_return _void{};
+}
+
+awaitable_expected< void > ThermometerMeasurements::start() {
+    BOOST_ASSERT(_sensor);
+
+    // subscribe to a thermometer readings
+    ASYNC_CHECK_LOG(subscribeToTemperatureUpdate(), "subscribtion to temperature stream failed");
+
+    // spins own mqtt listener 'thread' and executes on update callback on every temperature update
+    boost::asio::co_spawn(_io, _sensor->listen(), boost::asio::detached);
+    co_return _void{};
+}
+
+std::optional< Trend > ThermometerMeasurements::temperatureTrend(std::chrono::nanoseconds window, double epsilon_deg_per_min) const {
+    if(auto last = timeSinceLastRead(); not last.has_value()) {
+        _log.debug("No temperature samples available");
+        return std::nullopt;
+    }
+
+    if(_history.size() < 2) {
+        _log.debug("Too few samples in the last {} minutes, no trend can be calculated",
+          std::chrono::duration_cast< std::chrono::duration< double, std::ratio< 60 > > >(window).count());
+        return Trend::Const;
+    }
+
+    const auto now          = std::chrono::system_clock::now();
+    const auto window_start = now - window;
+
+    struct Point {
+        double t_s;
+        double temp;
+        std::chrono::system_clock::time_point when;
+    };
+    std::vector< Point > pts; // pmr vector
+    pts.reserve(_history.size());
+
+    for(const auto & m : _history) {
+        if(m.when < window_start || m.when > now)
+            continue;
+
+        double t_s = std::chrono::duration< double >(m.when - window_start).count();
+        double y   = m.data.temp_c();
+        pts.push_back({t_s, y, m.when});
+    }
+
+    if(pts.size() < 2) {
+        _log.debug("Too few samples in the last {} minutes, no trend can be calculated",
+          std::chrono::duration_cast< std::chrono::duration< double, std::ratio< 60 > > >(window).count());
+        return Trend::Const;
+    }
+
+    // Posortuj czasowo (przyda się w fallbacku)
+    std::sort(pts.begin(), pts.end(), [](const Point & a, const Point & b) { return a.when < b.when; });
+    // Regresja liniowa y = a + b * t
+    double sum_t{};
+    double sum_y{};
+    double sum_tt{};
+    double sum_ty{};
+    for(const auto & p : pts) {
+        sum_t += p.t_s;
+        sum_y += p.temp;
+        sum_tt += p.t_s * p.t_s;
+        sum_ty += p.t_s * p.temp;
+    }
+
+    const double n     = static_cast< double >(pts.size());
+    const double denom = (n * sum_tt - sum_t * sum_t);
+
+    double slope_deg_per_s = 0.0;
+    if(denom != 0.0) {
+        slope_deg_per_s = (n * sum_ty - sum_t * sum_y) / denom; // b
+    } else {
+        // fallback: pochylona między pierwszą i ostatnią próbką
+        const double dt_s = std::chrono::duration< double >(pts.back().when - pts.front().when).count();
+        if(dt_s <= 0.0) {
+            _log.warn("No time spread in samples (dt = {}).", dt_s);
+            return Trend::Const;
+        }
+        slope_deg_per_s = (pts.back().temp - pts.front().temp) / dt_s;
+    }
+
+    const double slope_deg_per_min = slope_deg_per_s * 60.0;
+
+    _log.debug(
+      "Trend (5 min): samples={}, slope={:.4f} °C/min, threshold={:.4f} °C/min", pts.size(), slope_deg_per_min, epsilon_deg_per_min);
+
+    if(slope_deg_per_min > epsilon_deg_per_min)
+        return Trend::Rise;
+    if(slope_deg_per_min < -epsilon_deg_per_min)
+        return Trend::Fall;
+    return Trend::Const;
+}
+
+std::optional< double > ThermometerMeasurements::currentTemperature() const {
+    if(auto last = timeSinceLastRead(); not last.has_value()) {
+        return std::nullopt;
+    }
+    return _history.back().data.temp_c();
+}
+
+std::optional< std::chrono::nanoseconds > ThermometerMeasurements::timeSinceLastRead() const {
+    if(_history.size() == 0)
+        return std::nullopt;
+
+    auto timeDiff = std::chrono::system_clock::now() - _history.back().when;
+
+    if(timeDiff < std::chrono::nanoseconds{0}) {
+        memory_resource::MonotonicStackResource< 64 > mr;
+        auto now_ts  = date::to_iso_timestamp(std::chrono::system_clock::now(), &mr);
+        auto meas_ts = date::to_iso_timestamp(_history.back().when, &mr);
+        _log.warn("measurements are from the future (measurement: {}, now: {})", meas_ts, now_ts);
+    }
+
+    return timeDiff;
+}
+
+} // namespace ranczo
diff --git a/services/floorheat_svc/temperature_measurements.hpp b/services/floorheat_svc/temperature_measurements.hpp
new file mode 100644
index 0000000..ec0c0e6
--- /dev/null
+++ b/services/floorheat_svc/temperature_measurements.hpp
@@ -0,0 +1,106 @@
+#pragma once
+
+#include "config.hpp"
+#include "thermometer.hpp"
+
+#include <boost/circular_buffer.hpp>
+
+#include <memory>
+
+namespace ranczo {
+class Thermometer;
+
+enum class Trend { Fall, Const, Rise };
+
+inline std::pmr::string to_string(Trend state) {
+    switch(state) {
+        case Trend::Fall:
+            return "Fall";
+        case Trend::Const:
+            return "Const";
+        default:
+            return "Rise";
+    }
+}
+template <>
+inline std::optional< Trend > from_string(std::optional< std::string_view > state, std::pmr::memory_resource * mr) {
+    BOOST_ASSERT(mr);
+
+    if(not state) {
+        return std::nullopt;
+    }
+    std::pmr::string s(state->begin(), state->end(), mr);
+    std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return static_cast< char >(std::tolower(c)); });
+
+    if(s == "fall")
+        return Trend::Fall;
+    if(s == "const")
+        return Trend::Const;
+    if(s == "rise")
+        return Trend::Rise;
+    return std::nullopt;
+}
+
+/**
+ * @brief The ThermometerMeasurements class. It listens to thermometer async temperature update and stores those as a linear history
+ * @todo We can read the history of measurements from PG database that stores them,
+ *          optional as we will not reload this service often so we can store our own  measurements for couple of minutes
+ */
+struct ThermometerMeasurements {
+    struct Measurement {
+        std::chrono::system_clock::time_point when;
+        Thermometer::ThermometerData data;
+    };
+    executor & _io;
+    ModuleLogger _log;
+    std::unique_ptr< Thermometer > _sensor;
+    boost::circular_buffer< Measurement > _history;
+
+    ThermometerMeasurements(executor & io, std::unique_ptr< Thermometer > sensor);
+
+    /**
+     * @brief start the service, we can't make it happen in ctor so we need a different approach
+     * @return
+     */
+    awaitable_expected< void > subscribeToTemperatureUpdate() {
+        return _sensor->on_update([&](auto data) { return this->temperatureUpdateCallback(data); });
+    }
+    
+    /**
+     * @brief temperatureUpdateCallback
+     * @param data
+     * @return 
+     */
+    awaitable_expected< void > temperatureUpdateCallback(Thermometer::ThermometerData data);
+    
+    /**
+     * @brief start
+     * @return 
+     */
+    awaitable_expected< void > start();
+
+    /**
+     * @brief timeSinceLastRead
+     * @return a time that passed since last temperature read or nullopt if no measurements are available
+     */
+    std::optional< std::chrono::nanoseconds > timeSinceLastRead() const;
+
+    /**
+     * @brief currentTemperature
+     * @return temperature or nothing if no temp is yet available
+     */
+    std::optional< double > currentTemperature() const;
+
+    std::size_t size() const noexcept {
+        return _history.size();
+    }
+    /**
+     * @brief temperatureTrend
+     * @param window which should be used to get the trend
+     * @param epsilon_deg_per_min, trend specyfier
+     * @return a trend if trent can be calculated or nullopt
+     */
+    std::optional< Trend > temperatureTrend(std::chrono::nanoseconds window = std::chrono::minutes(5),
+      double epsilon_deg_per_min                                            = 0.2) const;
+};
+} // namespace ranczo