Do not allow the modem to sleep if the driver is busy.
Fix CTS filtering. Ignore small pulses on the CTS line.
Fix socket restoration. Restored sockets could be mismatched
with a wrong type.
UDP sockets could be duplicated during restore.
Improve IO debug mode. Use warning message for IO debug mode
to easily see IO transitions color coded in a terminal.
Ensure the UART is enabled whenever the driver needs to send
commands to the modem.
Ensure DNS resolver is re-initialized after the modem is powered off.
PROD-307
Signed-off-by: Ryan Erickson <ryan.erickson@lairdconnect.com>
8deaf18d8b