Mqtt not working after 4 hours


I am using SIM800L and ESP with MQTT protocol for a project,MQTT is disconnecting after 4 hours can anyone say me solution for this issue?Thanks in Advance

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Actually,I also faced the same issue,I have tried couple of variations but didn’t work out.I had to restart the module after some times by putting a count variable so that it keeps on running all the time.Do remember you have to turn off gprs mode for sim800l before reseting the module.

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Can you give some free MQTT Broker credentials ?