BG95-M3 MQTT stability on LTE-CAT M1 and AT+QMTCLOSE Error

IoT Modules LPWA Module
1

Hi all,
we have the first project with a BG95 and facing two issues at the moment:

If we connect via GSM the mqtt connection works fine via LTE-CATM1 it is losing the connection very often (basically everytime after some minutes) but the connection itself (antenna should be fine) as I get this QCSQ info:
AT+QCSQ:“eMTC”,55,76,208,8. Is this an issue with CATM1 itself, as it is for low power can the connection be on all the time (using Magenta - tmobile in austria)

As a work around we try to reconnect the mqtt connection, but we get always an error on AT+QMCLOSE=0\r\n (mqtt client 0 used) and then the AT+QMTOPEN is not working (MQTT identifier is occupied). We do a disconnection first which is working as we can see in the AWS terminal (client initiated closing)
Thanks

2

  1. Generally speaking, CATM is more stable than GSM, unless the signal of CATM is too poor

  2. about your case ， pls pay more attention to the mqtt qos and clean mode parameter ， and make sure the mqtt session has been closed completely . thanks

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