multicell_location_sample: Failed to acquire location, error: -35

Question

Hi Nordic team

I failed to demostarte multicell location sample.

Hardware: Thingy91

SDK: v1.6.0/multicell location

Modem: v1.3.0

Q1. At prj.conf, nrf cloud location service was enabled. But, I have no idea how to set up credentials (API key).

At multicell location library document, it didn't built up a link how to configure at my nrf cloud account.

At my nrf cloud account, I found below. Was it the API key used for location service?

Q2. Below is my log out. I used the API key from my account. However, HTTP server didn't respond when request was sent. What does error -35 mean?

At document said, so far, it's only SCELL but not MCELL. So, it was normal at the log that no neighbor cells were found?

Fullscreen 新文字文件.txt Download

[00:01:02.289,062] [0m<inf> multicell_location_sample: Periodical start of cell measurements[0m
%NCELLMEAS: 0,"04D70817","46692","3390",65535,1750,413,45,26,63427
[00:01:03.632,812] [0m<inf> multicell_location_sample: Neighbor cell measurements received[0m
[00:01:03.641,998] [0m<inf> multicell_location_sample: Current cell:[0m
[00:01:03.649,108] [0m<inf> multicell_location_sample: 	MCC: 466[0m
[00:01:03.655,883] [0m<inf> multicell_location_sample: 	MNC: 092[0m
[00:01:03.662,628] [0m<inf> multicell_location_sample: 	Cell ID: 81201175[0m
[00:01:03.670,227] [0m<inf> multicell_location_sample: 	TAC: 13200[0m
[00:01:03.677,154] [0m<inf> multicell_location_sample: 	EARFCN: 1750[0m
[00:01:03.684,295] [0m<inf> multicell_location_sample: 	Timing advance: 65535[0m
[00:01:03.692,321] [0m<inf> multicell_location_sample: 	Measurement time: 63427[0m
[00:01:03.700,500] [0m<inf> multicell_location_sample: 	Physical cell ID: 413[0m
[00:01:03.708,465] [0m<inf> multicell_location_sample: 	RSRP: 45[0m
[00:01:03.715,209] [0m<inf> multicell_location_sample: 	RSRQ: 26[0m
[00:01:03.721,954] [0m<inf> multicell_location_sample: *** No neighbor cells found ***[0m
[00:01:03.730,804] [0m<inf> multicell_location_sample: Sending location request...[0m
+CSCON: 1
[00:01:04.236,724] [0m<inf> multicell_location_sample: RRC mode: Connected[0m
[00:01:07.383,544] [1;31m<err> multicell_location_nrf_cloud: HTTP status was not "200"[0m
[00:01:07.392,272] [1;31m<err> multicell_location: Failed to parse HTTP response[0m
[00:01:07.400,543] [1;31m<err> multicell_location_sample: Failed to acquire location, error: -35[0m
[00:02:02.335,693] [0m<inf> multicell_location_sample: Periodical start of cell measurements[0m
%NCELLMEAS: 0,"04D70817","46692","3390",0,1750,413,38,22,122077
[00:02:02.361,053] [0m<inf> multicell_location_sample: Neighbor cell measurements received[0m
[00:02:02.370,269] [0m<inf> multicell_location_sample: Current cell:[0m
[00:02:02.377,441] [0m<inf> multicell_location_sample: 	MCC: 466[0m
[00:02:02.384,155] [0m<inf> multicell_location_sample: 	MNC: 092[0m
[00:02:02.390,930] [0m<inf> multicell_location_sample: 	Cell ID: 81201175[0m
[00:02:02.398,529] [0m<inf> multicell_location_sample: 	TAC: 13200[0m
[00:02:02.405,487] [0m<inf> multicell_location_sample: 	EARFCN: 1750[0m
[00:02:02.412,628] [0m<inf> multicell_location_sample: 	Timing advance: 0[0m
[00:02:02.420,227] [0m<inf> multicell_location_sample: 	Measurement time: 122077[0m
[00:02:02.428,527] [0m<inf> multicell_location_sample: 	Physical cell ID: 413[0m
[00:02:02.436,523] [0m<inf> multicell_location_sample: 	RSRP: 38[0m
[00:02:02.443,298] [0m<inf> multicell_location_sample: 	RSRQ: 22[0m
[00:02:02.450,042] [0m<inf> multicell_location_sample: *** No neighbor cells found ***[0m
[00:02:02.458,892] [0m<inf> multicell_location_sample: Sending location request...[0m
+CSCON: 0
[00:02:26.435,546] [0m<inf> multicell_location_sample: RRC mode: Idle[0m
+CSCON: 1
[00:02:26.498,107] [0m<inf> multicell_location_sample: RRC mode: Connected[0m
+CSCON: 0
[00:02:27.819,702] [0m<inf> multicell_location_sample: RRC mode: Idle[0m
+CSCON: 1
[00:02:29.088,134] [0m<inf> multicell_location_sample: RRC mode: Connected[0m
[00:02:32.178,924] [1;31m<err> multicell_location_nrf_cloud: HTTP status was not "200"[0m
[00:02:32.187,652] [1;31m<err> multicell_location: Failed to parse HTTP response[0m
[00:02:32.195,922] [1;31m<err> multicell_location_sample: Failed to acquire location, error: -35[0m
+CSCON: 0

Thanks.

Jeffery

Patrick Barnes · Answer

API keys are no longer used to authenticate Location Service endpoints. You must use JSON Web Tokens (JWTs). See docs.nrfcloud.com/.../REST . The master branch has been updated to use JWTs. (Unfortunately, nRF Cloud and the Nordic Connect SDK can get out of sync at times. When in doubt, use the master branch.) 
 Also v1.6 does not support multi-cell, but only single-cell.

Patrick Barnes · Answer

Close. More precisely, every nRF9160 device consuming Location Services via REST must have their own private key for signing JWTs. These are called "Device Keys". Have you read https://docs.nrfcloud.com/Reference/Interacting/REST#json-web-tokens-jwt and https://docs.nrfcloud.com/Guides/UsingREST/JWT ? These documents contain the info you need.