The current firmware version in the BG95M3 is BG95M3LAR02A03_31.201.31.201, which does not support MQTT. I request you to provide the firmware that supports MQTT. WE Are requesting the below any one of the following FW
BG95M3LAR02A03_01.200.01.200
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BG95M3LAR02A03_01.012.01.012
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BG95M3LAR02A03_A0.206.A0.206
The above Fw will support the MQTT