nRF9160 (Thingy91) not connecting to Lwm2m server as a lwm2m client.

[john66]

Hi,

I am trying to connect to an LwM2M server using thingy91. I have Leshan demo-server hosted remotely on cloud it provides me IPv6 address to connect, as my network provider provides only IPv6. 

I have setup all the security configurations of the device on the server side as shown in the documentation. I have setup same credentials on the device side using credential management AT command and saved it to NVM.

I am using ncs v2.2.0. I changed server address and port, enabled CONFIG_NET_IPV6 in the prj.conf file of lwm2m_clinet project in samples. built and flashed the application to my device.

I am not able to connect to the  lwm2m server from my device.

Here are some of the logs:

[00:00:00.499,572] <err> ADXL362: wrong part_id: 0

*** Booting Zephyr OS build v3.2.99-ncs1 ***
[00:00:01.508,239] <inf> BH1749: BH1749 initialized
[00:00:01.513,366] <inf> app_lwm2m_client: Run LWM2M client
[00:00:01.513,397] <inf> app_lwm2m_client: Initializing modem.
[00:00:01.531,860] <inf> app_lwm2m_client: endpoint: urn:imei:35xxxxxxxxxxx22
[00:00:01.539,428] <dbg> app_lwm2m_buzzer: buzzer_intensity_cb: Intensity: 100
[00:00:01.539,611] <err> accelerometer: Accelerometer device not ready
[00:00:01.540,222] <inf> lwm2m_firmware: Image is not confirmed OK
[00:00:01.540,283] <inf> lwm2m_firmware: Marked image as OK
[00:00:01.540,283] <inf> app_lwm2m_client: Connecting to network.
[00:00:01.540,313] <inf> app_lwm2m_client: This may take several minutes.
[00:01:10.853,454] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 4
uart:~$

after 10 mins my device keeps retrying to connect to the server and network and fails, here are some of the logs device retrying to connect:

[00:10:01.585,540] <inf> lte_lc: Network connection attempt timed out
[00:10:01.597,320] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 0
[00:10:01.599,121] <inf> lte_lc: Using fallback network mode
[00:10:03.202,117] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 2
[00:10:11.526,977] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 1
[00:10:11.527,832] <inf> app_lwm2m_client: Connected to NB-IoT network
[00:10:11.532,287] <inf> app_lwm2m_client: Client connect to server
[00:10:11.532,348] <inf> net_lwm2m_rd_client: Start LWM2M Client: urn:imei:35xxxxxxxxxx22
[00:10:11.867,736] <dbg> app_lwm2m_temp_sensor: app_event_handler: Temperature sensor event received: val1 = 000028, val2 = 030000
[00:10:11.867,950] <dbg> app_lwm2m_press_sensor: app_event_handler: Pressure sensor event received: val1 = 000090, val2 = 823000
[00:10:11.868,194] <dbg> app_lwm2m_humid_sensor: app_event_handler: Humidity sensor event received: val1 = 000050, val2 = 743000
[00:10:11.868,408] <dbg> app_lwm2m_gas_res_sensor: app_event_handler: Gas resistance sensor event received: val1 = 015170, val2 = 000000
[00:10:12.130,523] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:12.206,359] <inf> lwm2m_security: Need to write credentials, requesting LTE and GNSS offline...
[00:10:12.608,551] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 0
[00:10:12.608,703] <inf> app_lwm2m_client: LwM2M is connecting to server
[00:10:13.385,620] <inf> lwm2m_security: Requesting LTE and GNSS online
[00:10:14.534,149] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 2
[00:10:20.406,768] <inf> lwm2m_security: Modem connection restored
[00:10:20.407,287] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 1
[00:10:20.407,562] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:20.407,714] <inf> app_lwm2m_client: LwM2M is connecting to server
[00:10:20.407,867] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:21.408,294] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:21.484,710] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:21.484,954] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:22.985,504] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:23.061,798] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:23.062,072] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:25.562,835] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:25.639,068] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:25.639,343] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:30.140,441] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:30.216,644] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:30.217,010] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:38.718,994] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:38.795,043] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:38.795,318] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:38.795,349] <err> app_lwm2m_client: LwM2M engine reported a network error.
[00:10:38.795,471] <inf> net_lwm2m_rd_client: Stop LWM2M Client: urn:imei:35xxxxxxxxxxx22
[00:10:39.295,684] <inf> app_lwm2m_client: LwM2M restart requested. The sample will try to re-establish network connection.
[00:10:39.650,299] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 0
[00:10:39.829,681] <inf> app_lwm2m_client: Connecting to network.
[00:10:39.829,681] <inf> app_lwm2m_client: This may take several minutes.
[00:10:40.934,936] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 2
[00:10:44.727,752] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 1
[00:10:44.728,607] <inf> app_lwm2m_client: Connected to NB-IoT network
[00:10:44.728,637] <inf> app_lwm2m_client: Client connect to server
[00:10:44.728,698] <inf> net_lwm2m_rd_client: Start LWM2M Client: urn:imei:35xxxxxxxxxxx22
[00:10:45.297,271] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:45.373,413] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:45.373,687] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:46.374,114] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:46.450,439] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:46.450,683] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:47.951,232] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:48.027,435] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:48.027,709] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:50.528,442] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:50.604,614] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:50.604,888] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:10:55.029,113] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:10:55.105,621] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:10:55.105,895] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:03.606,872] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:03.683,197] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:03.683,471] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:03.683,502] <err> app_lwm2m_client: LwM2M engine reported a network error.
[00:11:03.683,624] <inf> net_lwm2m_rd_client: Stop LWM2M Client: urn:imei:35xxxxxxxxxxx22
[00:11:04.183,837] <inf> app_lwm2m_client: LwM2M restart requested. The sample will try to re-establish network connection.
[00:11:04.620,330] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 0
[00:11:04.737,640] <inf> app_lwm2m_client: Connecting to network.
[00:11:04.737,670] <inf> app_lwm2m_client: This may take several minutes.
[00:11:05.895,385] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 2
[00:11:11.608,551] <dbg> app_lwm2m_client: lwm2m_lte_reg_handler_notify: LTE NW status: 1
[00:11:11.609,375] <inf> app_lwm2m_client: Connected to NB-IoT network
[00:11:11.609,405] <inf> app_lwm2m_client: Client connect to server
[00:11:11.609,466] <inf> net_lwm2m_rd_client: Start LWM2M Client: urn:imei:35xxxxxxxxxxx22
[00:11:12.185,882] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:12.262,115] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:12.262,390] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:13.262,847] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:13.339,233] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:13.339,508] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:14.840,026] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:14.912,475] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:14.912,750] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:17.413,482] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:17.485,626] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:17.485,900] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)
[00:11:21.987,121] <inf> net_lwm2m_rd_client: RD Client started with endpoint 'urn:imei:35xxxxxxxxxxx22' with client lifetime 30
[00:11:22.063,262] <err> net_lwm2m_engine: Cannot connect UDP (-114)
[00:11:22.063,537] <err> net_lwm2m_rd_client: Cannot init LWM2M engine (-114)

Can anyone please help me to connect to my server through lwm2m.

[Charlie]

Hi Yadunandan,

Have you followed nRF9160: LwM2M Client to test with the public leshan-server-demo (eclipseprojects.io) yet? The current Leshan server demo is using 2.0.0-SNAPSHOT as mentioned in about page leshan-server-demo (eclipseprojects.io).

You can verify with Leshan server demo first and compare the difference with the Leshan server version you are using.

Best regards,

Charlie

[john66]

Hello Charlie, Thanks for your response.

I have already tried to connect to Public leshan-server-demo, I didn't face any difficulties as the documentation is very straight forward.

But I am having issues only to connect to my server. I have few doubt's which I think maybe the reason.

1. My server doesn't have DNS configured, hence I am giving only the IPv6 address in place of domain name.

2. Can I pass server's IP address instead of URL or domain name. 

Is there any alternate method to use Lwm2m with AT commands instead of running a whole different firmware?

Is there any way that I can add my custom objects to the device?

Having AT commands for lwm2m will make our project, easier as we can use an external MCU to communicate through UART.

[Achim Kraus]

Are you sure, that your mobile network provider supports ipv6?

Name:    leshan.eclipseprojects.io
Address: 23.97.187.154
Name:    leshan.eclipseprojects.io
Address: 2a01:111:f100:9001::1761:93fa

You may try to use the literal IPs and see, if that works.

[john66]

My apologies, If I have confused you, I am able to connect to public to leshan-server-demo. With just the "leshan.eclipseprojects.io:5684". 

But I am not able to connect to our demo server hosted on a VM.

[Achim Kraus]

Yes, but does:

"23.97.187.154:5684"

works as well? And

"[2a01:111:f100:9001::1761:93fa]:5684"?

And if you use "leshan.eclipseprojects.io:5684", which destination ip-address is used?

[john66]

I am able to connect to "[2a01:111:f100:9001::1761:93fa]:5684". Now I am able to connect to our server as well. I was not clear on the syntax that I have to give '[' and ']' on both ends of the IP address.

Thank you for helping Achim. 

One more question for you. I have worked with various Quectel's LPWAN  modules. It has AT commands for lowm2m as well. we can perform multiple operations like registration, deregistration, add custom objects, notify to observe requests, etc.

Do we have any provision of using such AT command library with nrf9160 so that it becomes easy to control with an external MCU.

[Achim Kraus]

> Now I am able to connect to our server as well.

Great!

Sorry, AFAIK, the "serial lte modem" doesn't come with at-lwm2m-cmds.

[john66]

Got it,

Thanks for Helping.

Is there any way that I can write a application on top of LWm2m client with Serial Lte Modem and add some AT commands for lwm2m?

Any suggestions on achieving this will be helpful.