Why is "No location data available" always printed when SUPL data is downloaded in gps sample app? This happens at any place. I guess this causes a long TTFF.
This is a log downloading SUPL data.
*** Booting Zephyr OS build v2.3.0-rc1-ncs1 *** Staring GPS application LTE Link Connecting ... LTE Link Connected! GPS Socket created Getting GPS data... New AGPS data requested, contacting SUPL server, flags 59 Established LTE link ip adc2:4cc0::e01:300:1e00:1e00 (c04cc2ad) port 7276 Starting SUPL session ULP encoding length: 38 Bytes sent: 38 Bytes received: 34 ULP ossDecode success, choice 3 SUPL server responded using version 2.0.4 SUPL response received ULP encoding length: 57 Bytes sent: 57 Bytes received: 708 ULP ossDecode more input 4 Bytes received: 1416 ULP ossDecode more input 4 Bytes received: 2124 ULP ossDecode more input 4 Bytes received: 2832 ULP ossDecode more input 4 Bytes received: 2923 ULP ossDecode success, choice 5 Injected AGPS data, flags: 1, size: 16 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 2, size: 72 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 Injected AGPS data, flags: 3, size: 32 No integrity data available Injected AGPS data, flags: 4, size: 8 Injected AGPS data, flags: 6, size: 144 No location data available Injected AGPS data, flags: 7, size: 16 MCC location info injected, MCC: 440 Lat: SOMEPLACE Lon: SOMEPLACE Unc semiminor: 127 Unc semimajor: 127 Confidence: 90 Orientation: 0 SUPL POS received read again read again Bytes received: 34 ULP ossDecode success, choice 6 SUPLEND: Mask: 0 Status: 0 SUPL END received SUPL session internal resources released SUPL session finished Done
I read these tickets.
devzone.nordicsemi.com/.../246484
https://devzone.nordicsemi.com/f/nordic-q-a/59034/agps_thingy91/240218#240218
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.
The center of my country is way far from my place.
Isn't this bug in SUPL file?
