Unable to connect to nRF Cloud - Error -128

RE: Unable to connect to nRF Cloud - Error -128

Maximilian Deubel — Mon, 05 May 2025 13:15:07 GMT

Interesting! Having a BLE beacon running on an nRF91+nRF52 setup is a use case I didn't have on my list yet. I could suggest trying out the Modem Shell sample with BT support: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/cellular/modem_shell/README.html#bt_shell_support There is some nRF Cloud support included as well (kconfig adjustments might be needed). As for redundancy for nRF91-DK + nRF52-DK, this could be useful considering that the newer nRF9151-DK comes without at BT companion chip.

RE: Unable to connect to nRF Cloud - Error -128

Yun531 — Tue, 29 Apr 2025 13:15:18 GMT

Hi, thank you for your response.

For the use case, I have the nRF9160 DK connects to the nRF Cloud via LTE, I'm trying to remote control it by sending commands from the Cloud. Once the nRF9160 DK receives the command, it'll control the onboard 52840 SOC to do BLE advertising.

The commands don't need to happen right away. For example, I'll have the 52840 SOC on a schedule to advertise every 5 hours for 10 minutes. The commands could be to change the interval to every 10 hours instead.

I tried to started with the LTE BLE Gateway because it seems like the closest sample to my need. Eventually, I'll have the nRF9160DK controls the nRF52840 DK instead (via UART) so that I could add the nRF21540 EK shield on the nRF52840DK to amplify the transmit power and range. The setup is kind of redundant, but I'm trying to evaluate the potential of using these SOC and SIP on my own custom board.

RE: Unable to connect to nRF Cloud - Error -128

Maximilian Deubel — Tue, 29 Apr 2025 12:44:20 GMT

Hi! It looks like you are on the right track. The latest error is -ECONNREFUSED, indicating that the sample has trouble getting internet. Unfortunately, this sample is no longer maintained and we cannot help you fix it. It's likely that some code change inside the sample is required. Could you elaborate your use case so we can try to find a sample that is better suited for you?

RE: Unable to connect to nRF Cloud - Error -128

Yun531 — Mon, 28 Apr 2025 19:02:54 GMT

Update:

After I enabled these KConfig options, I was able to get the nRF Cloud MQTT multi-service sample working again:

CONFIG_MODEM_JWT=y

CONFIG_NRF_CLOUD_CLIENT_ID_SRC_INTERNAL_UUID=y

But when I tried to flash the LTE BLE Gateway sample, I still got the same error (I did flash the nrf52 with HCI_UART first before flash the nrf91 with LTE_BLE_Gateway). The errors:

[00:00:06.188,903] <inf> nrf_cloud_info: IMEI: <Number>
[00:00:06.305,908] <inf> nrf_cloud_info: UUID: <The ID>
[00:00:06.306,304] <inf> nrf_cloud_info: Modem FW: mfw_nrf9160_1.3.7
[00:00:06.306,365] <inf> nrf_cloud_info: Protocol: MQTT
[00:00:06.306,396] <inf> nrf_cloud_info: Download protocol: HTTPS
[00:00:06.306,396] <inf> nrf_cloud_info: Sec tag: 16842753
[00:00:06.306,427] <inf> nrf_cloud_info: Host name: mqtt.nrfcloud.com
[00:00:06.630,554] <err> nrf_cloud_transport: Could not connect to nRF Cloud MQTT Broker mqtt.nrfcloud.com, port: 45858. err: -111

Any help would be appreciated! Thank you.