* [modbus] More strict nullness annotations
Taking into consideration that we always have default
EndpointPoolConfiguration
* [modbus] Utilize default pool configuration consistently
* [modbus] Make (internal) ModbusCommunicationInterfaceImpl constr private
* [modbus] Handle null config of modbus comm when detecting open conns
* [modbus] default connection timeout of 10s with default pool config
Signed-off-by: Sami Salonen <ssalonen@gmail.com>
In additions, command->registers tests have been once made more
readable, covering all the corner cases with integers.
Signed-off-by: Sami Salonen <ssalonen@gmail.com>
