MQTT : AT+QMTCONN gives result = 1 Packet retransmission

IoT Modules LTE Standard Module
1

Hi ,
I am using EC/EG 25 module for the MQTT connection.

AT+QMTCONN=<client_idx>,“< clientid >”[,“< username >”,"< password> "]

Above command gives result code as 1 (Packet retransmission)

query :

  1. What is the meaning of Packet retransmission ?
  2. How to handle this from host controller ? Do we need to wait and check some commands ?
2

Hi @lyman-Q
Could you please help on above query related to MQTT ?

3

Please provide your log

4

Hi ,
I dont have the AT log now as above observed while doing testing AT commands .

But here my following query is to understand how to handle this response in code ?

  1. What is the meaning of Packet retransmission ?
  2. How to handle this from host controller ? Do we need to wait and check some commands ?

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5

Packet retransmission indicates that the retransmission mechanism has been triggered in the protocol stack of the module, but the data is still not successfully sent by the air

6

Thanks @herbert.pan-Q for you reply .
But my question is that how we should handle this reply ? do we need to wait ? or canccel the current connection and try again ? or something else ?

7

I suggest first disconnecting and re-connecting; If it still fails, you need to reboot the module

8

Ok
Thanks

We will implement the logic similar to what you proposed