The MQTT TCP - using SIM800 | Arduino | Forum

Hi,

I'm developing the MQTT TCP for the SIM800 module, to publish and subscribe channel Thingspeak.
There is an issue related to the TCP connection between the SIM800 and Thingspeak server.
After 1 hour running, whenever I publish data to channel (successful), the TCP connection is closed,
although the conenction is still in alive time.

My setting:
+Publish data interval: 1 min
+Keep alive: 10 sec
+Mqtt server: mqtt.thingspeak.com
+Port: 1883

Plz help me!