Connect to NRF cloud using the Serial LTE Modem sample

[kurama9942]

Hi,

The NCS version I am using is 2.4.0

I have a 91DK which has a modem firmware of 1.3.5. I also have flashed the serial_lte_modem hex file. I saw that we can connect to NRF cloud using the asset tracker V2 hex file. Wanted to know if it is possible to do the same with serial lte modem hex file.

Thank you for your help.

Regards 

[justin]

yes you can connect to nRF Cloud using the pre-compiled Serial LTE Modem hex file.

it looks like you have found the device device credentials and provisioning documentation (note: we are in the process of changing this term to device onboarding), but i will list all the steps here:

1. Create and install credentials on your device.
   1. Create a self-signed CA cert and private key: see create_ca_cert.py
   2. Create/install a device private key and certificate: see device_credentials_installer.py
      This step uses the CA cert and private key pem files created in step 1a.
      By default, a provision.csv file is created when the script executes successfully.
      If your device is already running serial LTE modem, add --term CRLF to the python command.
      Example: 
      python3 ./device_credentials_installer.py --ca <CA_CERT.PEM> --ca_key <CA_PRIVATE_KEY.PEM> -d --term CRLF
2. Use the provision.csv file created in step 1b to provision (onboard) your device to nRF Cloud.
   
   1. Use the web UI: https://nrfcloud.com/#/add-device/bulk 
   2. Or use the REST API: https://api.nrfcloud.com/v1#tag/IP-Devices/operation/ProvisionDevices
3. When your device has been successfully added to your nRF Cloud account, it should appear in your device list: https://nrfcloud.com/#/devices
4. Now connect the device with serial LTE modem:
   

   > AT+CFUN=1
   
   OK
   > AT+CEREG?
   
   +CEREG: 0,5,"900A","0509260F",7
   
   OK
   > AT#XNRFCLOUD=1
   
   OK
   
   #XNRFCLOUD: 1,0
   > AT#XNRFCLOUD?
   
   #XNRFCLOUD: 1,0,16842753,"50503642-3239-4f86-80c4-06122e299623"
   
   OK

[kurama9942]

Hi,

Thank you for replying. I have done these steps and have already gotten my device added to NRF Cloud. I also did step 4. But I couldn't get line 13. I am not sure where I am going wrong.

Regards

[justin]

is your device ID 5053544b-3234-42e5-8055-0a1a818c78e2?
That device does not exist in nRF Cloud.

[kurama9942]

If you are talking about my UUID then no. But that's odd as I can see my device with my UUID number as shown below:-

[justin]

to use the prebuilt serial LTE modem hex file to connect to nRF Cloud you will need to use the device's internal UUID (5053544b-3234-42e5-8055-0a1a818c78e2) as your nRF Cloud device ID.

if you follow the steps i provided, it will onboard the device using that UUID as the device ID.

it should be sufficient to delete your device from nRF Cloud and then modify the provision.csv, replacing dc8e7aff-5331-409e-be02-5529dffa5537 with 5053544b-3234-42e5-8055-0a1a818c78e2.
then re-provision/onboard your device.

[justin]

and if you need to use your own UUID, you will need to build the serial LTE modem project with your ID in the configuration:

CONFIG_NRF_CLOUD_CLIENT_ID_SRC_COMPILE_TIME=y
CONFIG_NRF_CLOUD_CLIENT_ID="dc8e7aff-5331-409e-be02-5529dffa5537"

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/libraries/networking/nrf_cloud.html#configuration-options-for-device-id