• Removing unused parameter Client & of ArduinoIoTCloud::reconnect()
• Register a function for retrieving a global timestamp with ArduinoCloudThing (necessary to break hidden dependency to RTCZero - see here).
• Bugfix: The TCP load balancer of the Arduino IoT Cloud terminates a TCP connnection after 350 seconds. Unfortunately this termination is only detected after transmitting the next data set to the Arduino IoT Cloud. This has the unfortunate side effect that the data set sent to the cloud is lost. This change buffers every transmission to the server and requests a retransmission in case of loosing the connection. Note: This can only happen if the keep-alive interval is set to a value > 350 seconds.