WIZnet Developer Forum

WizFi360 stopped working during MQTT

I was setting up MQTT using YAT.
I typed one AT command wrong. After this the wifi module is broken.
Cannot reset. Removing power supply and reconnecting is not helping. Is is as if module is dead.

The wrong command I typed is "AT+MQTTTCON=0,“192.168.1.6"1883”
I missed a comma, and there is an extra ‘T’

could you please help recover the module?

See full session here:

OK
AT+CIPSTA_CUR?
AT+CIPSTA_CUR?
+CIPSTA_CUR:ip:“192.168.12.8”
+CIPSTA_CUR:gateway:“192.168.12.1”
+CIPSTA_CUR:netmask:“255.255.255.0”

OK
AT+MQTTSET =“USN”,“PWS”,“CID”,60
AT+MQTTSET =“USN”,“PWS”,“CID”,60

ERROR
AT+MQTTSET=“USN”,“PWS”,“CID”,60
AT+MQTTSET=“USN”,“PWS”,“CID”,60

OK
AT+MQTTTOPIC=“test”,“stopic”
AT+MQTTTOPIC=“test”,“stopic”

OK
AT+MQTTTCON=0,"192.168.1.6"1883
AT+MQTTCON=0,"192.168.1.6"1883
AT+MQTTPUB=“12323”
AT+CWMODE_CUR=1
AT+CWMODE_CUR=1
AT

Hello.

Can’t you input AT commands even after removing power supply and reconnecting?

Hi Austin,
That is correct.
I cannot input AT command even after removing power supply and reconnecting.
I think the module is dead.
I am curious to know why a bad AT command has caused this?

Regards,
Hari

Hi,

I did a test, but unfortunately, the problem you asked for was not found, so it is difficult to understand why it occurs.

Could you try typing AT command after typing ‘+++’ in the terminal program?

If it still doesn’t work, could you try again after updating the latest version(v1.1.1.7) firmware with UART0?

Thanks.
Best regards.

Hi Austin,

I just tried to connect on uart 0 to do fw update.
No response. So looks like module is dead.
Will see if this happens again on next module.

Hari

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