questions for AGPS

[Siyou]

Hi

I merged the AGPS to serial_lte_modem slm_at_gps.c but it did not work:

1, if I activate LTE in gps_thread_fn(), it will be failed in supl_session();

00> Established LTE link
00> 
00> Starting SUPL session
00> ip 6cb1:61c0:: (c061b16c) port 7276
00> 
00> ossinit failed, rc: 8
00> 
00> SUPL session internal resources released
00> 
00> Done

2, If I activated LTE and attached to network before starting GPS, the gps_data.data_id will never be NRF_GNSS_AGPS_DATA_ID, so the GPS will have no opportunity to download SUPL data from server. why?

[Didrik Rokhaug]

It looks like you are able to initialize the decoding library now, which is good.

The error a stack overflow, as is said in the log.

You could try to figure out what thread overflows by using k_current_get, but my guess is that it is the GPS thread where you are running the SUPL library.

You could try to increase the stack size of that thread a bit more.

[Siyou]

Hi Didrik,

Thanks for your help, now I can connect to the SUPL server and download the data.

But there is a new problem: it seems the AGPS has not took effect, I tried several times the results were the same. Can you also take a look at below log? Sorry I have not any knowledge of SUPL...

What is the meaning of log "No location data available"?

00> Starting SUPL session
00> [00:00:08.593,597] <inf> lte: +CEREG: 2,"0001","01A2D101",7,0,0,"11100000",~
00> [00:00:09.005,401] <inf> lte: +CEREG: 1,"0001","01A2D101",7,,,"11100000","1~
00> [00:00:09.005,432] <inf> lte: Connected to LTE network.
00> Established LTE link
00> 
00> ip 6cb1:61c0:: (c061b16c) port 7276
00> 
00> ULP encoding length: 38
00> 
00> Bytes sent: 38
00> 
00> Bytes received: 34
00> 
00> ULP ossDecode success, choice 3
00> 
00> SUPL server responded using version 2.0.4
00> 
00> SUPL response received
00> 
00> ULP encoding length: 57
00> 
00> Bytes sent: 57
00> 
00> Bytes received: 708
00> 
00> ULP ossDecode more input 4
00> 
00> Bytes received: 1416
00> 
00> ULP ossDecode more input 4
00> 
00> Bytes received: 2124
00> 
00> ULP ossDecode more input 4
00> 
00> Bytes received: 3065
00> 
00> ULP ossDecode success, choice 5
00> 
00> [00:00:09.490,722] <inf> agps: Injected AGPS data, flags: 1, size: 16
00> 
00> [00:00:09.491,943] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.492,553] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.493,316] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.494,110] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.494,720] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.495,391] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.496,063] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.496,673] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.497,253] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.498,107] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.500,762] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.501,373] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.502,136] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.502,716] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.503,356] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.504,058] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.504,669] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.505,371] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.506,134] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.506,713] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.509,338] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.510,009] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.510,742] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.511,383] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.512,115] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.512,725] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.513,366] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.514,190] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.514,984] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.515,563] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.518,188] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.518,951] <inf> agps: Injected AGPS data, flags: 2, size: 72
00> 
00> [00:00:09.519,348] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.519,714] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.520,172] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.520,538] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.521,087] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.521,453] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.522,003] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.522,399] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.525,024] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.525,390] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.525,970] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.526,306] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.526,672] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.527,160] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.527,526] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.528,076] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.528,442] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.529,022] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.530,273] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.530,670] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.531,158] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.531,555] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.532,104] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.532,470] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.533,020] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.533,386] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.533,721] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.534,179] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.534,545] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.535,095] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> [00:00:09.538,482] <inf> agps: Injected AGPS data, flags: 3, size: 32
00> 
00> No integrity data available
00> 
00> [00:00:09.539,093] <inf> agps: Injected AGPS data, flags: 4, size: 8
00> 
00> [00:00:09.549,652] <inf> agps: Injected AGPS data, flags: 6, size: 144
00> 
00> No location data available
00> 
00> No MCC location info available, MCC: 1
00> 
00> SUPL POS received
00> 
00> read again
00> 
00> Bytes received: 34
00> 
00> ULP ossDecode success, choice 6
00> 
00> SUPLEND:
00> 
00>   Mask: 0
00> 
00>   Status: 0
00> 
00> SUPL END received
00> 
00> SUPL session internal resources released
00> 
00> SUPL session finished
00> 
00> Done
00> 
00> [00:00:11.405,761] <inf> lte: +CEREG: 0,"0001","01A2D101",7,0,0,"11100000",~
00> [00:00:12.769,317] <inf> agps: GPS restarted
00> [00:00:14.769,439] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 7s
00> [00:00:14.769,561] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 7s
00> [00:00:14.806,579] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 7s
00> [00:00:15.806,671] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 8s
00> [00:00:16.807,250] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 9s
00> [00:00:17.806,884] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 10s
00> [00:00:18.807,067] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 11s
00> [00:00:19.806,213] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 12s
00> [00:00:20.806,793] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 13s
00> [00:00:21.807,373] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 14s
00> [00:00:22.806,610] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 15s
00> [00:00:23.807,373] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 16s
00> [00:00:24.807,098] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 17s
00> [00:00:25.806,884] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 18s
00> [00:00:26.807,464] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 19s
00> [00:00:27.807,067] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 20s
00> [00:00:28.806,640] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 21s
00> [00:00:29.807,220] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 22s
00> [00:00:30.807,006] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 23s
00> [00:00:31.807,586] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 24s
00> [00:00:32.807,189] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 25s
00> [00:00:33.806,762] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 26s
00> [00:00:34.807,434] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 27s
00> [00:00:35.807,098] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 28s
00> [00:00:36.807,647] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 29s
00> [00:00:37.806,915] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 30s
00> [00:00:38.806,945] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 31s
00> [00:00:39.807,739] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 32s
00> [00:00:40.807,586] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 33s
00> [00:00:41.807,769] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 34s
00> [00:00:42.809,112] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 35s
00> [00:00:43.808,593] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 36s
00> [00:00:44.809,204] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 37s
00> [00:00:45.808,837] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 38s
00> [00:00:46.808,837] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 39s
00> [00:00:47.809,387] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 40s
00> [00:00:48.808,807] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 41s
00> [00:00:49.808,319] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 42s
00> [00:00:50.808,868] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 43s
00> [00:00:51.809,417] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 44s
00> [00:00:52.809,020] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 45s
00> [00:00:53.808,746] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 46s
00> [00:00:54.809,417] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 47s
00> [00:00:55.808,959] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 48s
00> [00:00:56.809,417] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 49s
00> [00:00:57.808,959] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 50s
00> [00:00:58.809,600] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 51s
00> [00:00:59.809,143] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 52s
00> [00:01:00.809,570] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 53s
00> [00:01:01.808,593] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 54s
00> [00:01:02.809,539] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 55s
00> [00:01:03.809,143] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 56s
00> [00:01:04.809,600] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 57s
00> [00:01:05.808,990] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 58s
00> [00:01:06.809,387] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 59s
00> [00:01:07.809,936] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 60s
00> [00:01:08.809,326] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 61s
00> [00:01:09.809,204] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 62s
00> [00:01:10.809,295] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 63s
00> [00:01:11.809,844] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 64s
00> [00:01:12.809,326] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 65s
00> [00:01:13.809,844] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 66s
00> [00:01:14.809,356] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 67s
00> [00:01:15.809,906] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 68s
00> [00:01:16.809,539] <inf> agps: Tracking:1 Using:0 Unhealthy:0, since last fix 69s
00> [00:01:17.809,539] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 70s
00> [00:01:18.810,119] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 71s
00> [00:01:19.810,729] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 72s
00> [00:01:20.810,272] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 73s
00> [00:01:21.810,791] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 74s
00> [00:01:22.810,241] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 75s
00> [00:01:23.810,760] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 76s
00> [00:01:24.810,729] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 77s
00> [00:01:25.811,309] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 78s
00> [00:01:26.810,729] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 79s
00> [00:01:27.811,584] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 80s
00> [00:01:28.810,699] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 81s
00> [00:01:29.810,821] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 82s
00> [00:01:30.811,462] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 83s
00> [00:01:31.810,882] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 84s
00> [00:01:32.810,943] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 85s
00> [00:01:33.811,706] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 86s
00> [00:01:34.811,401] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 87s
00> [00:01:35.811,584] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 88s
00> [00:01:36.811,309] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 89s
00> [00:01:37.810,943] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 90s
00> [00:01:38.811,645] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 91s
00> [00:01:39.811,157] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 92s
00> [00:01:40.811,157] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 93s
00> [00:01:41.811,859] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 94s
00> [00:01:42.811,614] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 95s
00> [00:01:43.811,065] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 96s
00> [00:01:44.811,767] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 97s
00> [00:01:45.811,157] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 98s
00> [00:01:46.811,828] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 99s
00> [00:01:47.810,668] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 100s
00> [00:01:48.811,370] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 101s
00> [00:01:49.812,103] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 102s
00> [00:01:50.811,737] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 103s
00> [00:01:51.811,401] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 104s
00> [00:01:52.811,981] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 105s
00> [00:01:53.811,370] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 106s
00> [00:01:54.811,462] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 107s
00> [00:01:55.812,225] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 108s
00> [00:01:56.811,553] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 109s
00> [00:01:57.812,133] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 110s
00> [00:01:58.811,401] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 111s
00> [00:01:59.811,492] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 112s
00> [00:02:00.812,164] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 113s
00> [00:02:01.811,553] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 114s
00> [00:02:02.811,035] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 115s
00> [00:02:03.812,377] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 116s
00> [00:02:04.812,072] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 117s
00> [00:02:05.812,286] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 118s
00> [00:02:06.811,981] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 119s
00> [00:02:07.811,645] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 120s
00> [00:02:08.812,408] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 121s
00> [00:02:09.812,011] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 122s
00> [00:02:10.811,676] <inf> agps: Tracking:2 Using:0 Unhealthy:0, since last fix 123s
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[Didrik Rokhaug]

Great to hear you got it working!

May I ask what stack size you ended up with?

The "No location data available" means just that: the SUPL server does not have any location data to provide you. Instead, the library will fall back on its own table.

Google's SUPL server is keeping a database over cell tower positions, but this database is not complete. So the "No location data available" is expected and happens all the time.

When that happens, the library will fall back to assuming you are at the geographical center of the country you are in. How much this helps depends on the size of your country, and where in the country you are.

[Siyou]

Hi,

The stack size remained as 4KB, added "CONFIG_NEWLIB_LIBC=y" and 
"CONFIG_NEWLIB_LIBC_ALIGNED_HEAP_SIZE=16384"

Can you provide some SUPL server which supported chinese NB-IoT in China area for verification?

I have tried the server "221.176.0.55" with China Mobile NB-IoT but no luck, Could you help check below error log and point out how to get it work?

00> Starting SUPL session
00> [00:00:42.133,605] <inf> lte: +CEREG: 1,"5B82","01966A1C",9,,,"00100001","0~
00> [00:00:42.133,605] <inf> lte: Connected to LTE network.
00> Established LTE link
00> ip ddb0:37:: (3700b0dd) port 7275
00> Connected to SUPL server "221.176.0.55:7275"
00> ULP encoding length: 38
00> Bytes sent: 38
00> Bytes received: 7
00> ULP ossDecode fail 5
00> SUPL error: 1
00> ULP encoding length: 18
00> Bytes sent: 18
00> SUPL session internal resources released
00> [00:00:42.500,152] <err> agps: SUPL session failed: -1
00> Done
00> [00:00:42.819,000] <inf> lte: +CEREG: 0,"5B82","01966A1C",9,0,0,"11100000",~
00> [00:00:43.192,077] <inf> agps: GPS restarted
00> [00:00:45.192,199] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 20s
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00> [00:00:50.217,346] <inf> agps: Tracking:0 Using:0 Unhealthy:0, since last fix 25s

[Didrik Rokhaug]

Hi, I am not aware of any SUPL servers that are supported in China, but I am looking into it.

The error you get is DATA_ERROR, which means that the data you receive from the server is not formatted correctly.

I have seen that error with another Chinese customer that tried to use the same server, but I was not able to identify the problem at the time.

One of my colleagues says that China Telecom has a server that can be used if you are using China Telecom, but we have not been able to find the IP address of that server. Is it the 221.176.0.55 server you are using?

I will look more into it tomorrow.