Gwendal

Closes # . *Brief pull request description*

**Brief description** Implement collection of generic message. - Gateway is able to group received message - Gateway can receive multiple requests at the same time For now groups are defined...

Broker compatibility: add option for brokers not 100% mqtt compliant

3

Some brokers (like AWS iot core) do not support qos=2 or retain messages. Add option to transport to specify the max qos value to use and also if the retain...

Closes # . *Brief pull request description*

Still rudimentary implementation

Patch to workaround faulty segger chip of nordic kit.