IoT_Example doesn't seem to be working

[adam6806]

Included the serial output. I am using CloudMQTT. I have the 7000G version. I was able to successfully work through the LTE Demo sketch. I did have to add these two lines.

fona.setPreferredMode(38); // Use LTE only, not 2G
fona.setPreferredLTEMode(1); // Use LTE CAT-M only, not NB-IoT

I added them to the IoT Example sketch as well. I am noticing some off characters so possibly a baud rate issue? I really don't know. It just sits there at the end. I know the cell connection isn't established because the light is blinking at the slower speed.

*** SIMCom Module IoT Example ***
Configuring to 9600 baud
Attempting to open comm with ATs
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<---
---> AT
<--- AT
---> ATE0
<--- ATE0
---> ATE0
<--- OK
---> ATI
<--- SIM7000G R1529

OK

---> AT+CPMS="SM","SM","SM"
<--- +CPMS: 0,10,0,10,0,10

FONA is OK
Found SIM7000G (Global)
---> AT+GSN
<--- RRR�⸮%5
⸮⸮⸮Module IoT Example ***
Configuring to 9600 baud
Attempting to open comm with ATs
---> AT
<--- OK
---> ATE0
<--- OK
---> ATE0
<--- OK
---> ATI
<--- SIM7000G R1529

OK

---> AT+CPMS="SM","SM","SM"
<--- +CPMS: 0,10,0,10,0,10

FONA is OK
Found SIM7000G (Global)
---> AT+GSN
<---⸮

[adam6806]

This last time I ran it seems like each time it's trying to get the IMEI from the FONA library it is looping. fona.getIMEI(imei);

[adam6806]

Still can't seem to find the difference between the iot example and lte demo example.

[wwkv]

I have the exact same issue, the LTE_demo works perfectly but the iot_demo stalls after the AT+GSN command...

[wwkv]

I found that Adafruit_MCP9808 tempsensor = Adafruit_MCP9808(); had an effect on the problem we have. When uncommenting this line (and all the lines involving the temperature sensor) the IMEI lookup was succesfull! Not quite sure why this is happening, maybe you know what's up? I'm happy though, only found this after hours of troubleshooting!

[wwkv]

All right, I found it! I installed a previous version of the Adafruit MCP9808 library and now it's working properly!

[adam6806]

Nice work @wwkv confirmed that does the trick for me as well. Your efforts are much appreciated :) @botletics can you please either update the documentation or implementation so that others don't fall into this issue please?

[adam6806]

@wwkv which version of the library did you use? I wasn't able to get it working with the adafruit mqtt example on any version.

[wwkv]

I used version 1.0.1. I'm still having issues too btw, the IMEI lookup works fine but if I enable the temperature sensor it doesn't want to connect to the MQTT. The only fix I now use temporarily is just uncomment all of the code that uses the MCP9808 library... I will look into it some more tomorrow.

[botletics]

Try commenting out the temperature sleep and wake up lines.