Persistent +QMTPUB: 0,0,2 during AWS OTA - Possible MQTT Stack Buffer Issue

IoT Modules LPWA Module
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Hi Quectel Support,

I am facing a recurring issue during AWS OTA updates where AT+QMTPUB consistently returns +QMTPUB: 0,0,2 (Packet transmission failure).

Module Details:

  • Module: [ BG95-M3]
  • Firmware: [BG95M3LAR02A03_A0.206.A0.206]

Issue Summary:

  • Connection Status: The modem reports a successful connection (+QMTCONN: 0,0,0), but every subsequent publish attempt fails with result 2.
  • Unrecoverable: Once this error occurs, it happens randomly during the update and the modem cannot recover without a hard reset.
  • Internal Stack: Even though the connection seems “alive,” the data fails to transmit.

Questions:

  1. Does this specific firmware version have any known issues or bugs regarding the internal MQTT stack buffer?
  2. Why does the modem report an active connection (0,0,0) while failing all transmission attempts?
  3. Is there a way to clear the MQTT buffers or recover the connection without a reboot?