after 600 seconds (=10 Minutes) the MQTT-SN-connection is closed by the server, but NB-IoT should be limited to 120 messages a day (1 message every 12 minutes). Is it possible to extend the timeout to 4000 seconds (or more), so the device can be online for about an hour before the MQTT-SN-Gateway closes the connection?
To establish the connection, I use: 0x1D, 0x04, 0x3D, 0x01, [PING_SEC], [IMSI], [PW]
PING_SEC can only be up to 0x0258 seconds, if it’s greater, it seems to be set to 0x0258 by the server.
Or should I ignore the limit of 120 messages per day for the actual tests?