Anyone have experience using the MQTT AT commands that can be used on the SARA R410? They seem to work well, except that the modem often gets stuck trying to first establish the MQTT connection using : AT+UMQTTC=1.
The response from the command can take up to 2 mins, but many times the modem becomes totally unresponsive after waiting 2 mins for the response. The only recovery is a hard reset.
I am on AT&T.
Any theories why the modem sometimes gets stuck with this command? Related to signal strength?