I get a ++QMTSTAT: 0,1 every 1minute in MQTT mode with SSL

I get a ++QMTSTAT: 0,1 every 1minute in MQTT mode after successful connection with SSL. Modem is mc60. The same promlem on 4G modem
AT+QMTCFG=“keepalive”,0,3600
What is wrong with MQTT server or settings of modem?

Hi,Powerball:
According to your description, this kind of problem exists on BOTH 4G module and MC60, indicating that this problem is associated with MQTT server. I suggest that you use MQTT. fx tool to connect MQTT server and conduct relevant tests through SSL security.
mqtt.fx tool