GPS data acquisition time with SUPL assist is longer than expected

[Yusuke]

Dk 0.8.5 with external GPS antenna
modem FW: v1.1.1
nrf tag:  v1.2.0
supl: v0.5.1
OS: Windows10

Put supl folder to "\ncs\nrf\ext\lib\bin\supl"
* the path written in readme.rst in supl foder is wrong: \ncs\nrf\ext\bin\supl
Fix it.

I run "gps" sample program setting CONFIG_SUPL_CLIENT_LIB=y.

I expected quick gps data acquisition within a few seconds, but it takes 30~120 sec in the first acquisition.

Does it actually use SUPL data?

*** Booting Zephyr OS build v2.1.99-ncs1-rc2  ***
Staring GPS application
Socket created
Getting GPS data...
\x1B[1;1H\x1B[2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 0

Scanning [|] \x1B[1;1H\x1B[2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 0

Scanning [/] \x1B[1;1H\x1B[2JNew AGPS data requested, contacting SUPL server, flags 59
Established LTE link
ip adc2:4cc0:: (c04cc2ad) port 7276
Starting SUPL session
ULP encoding length: 38
Bytes sent: 38
Bytes received: 34
ULP ossDecode success, choice 3
SUPL response received
ULP encoding length: 57
Bytes sent: 57
Bytes received: 1024
ULP ossDecode more input 4
Bytes received: 1969
ULP ossDecode more input 4

Bytes received: 3065
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: 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
SUPL POS received
read again
Bytes received: 34
ULP ossDecode success, choice 6
SUPLEND:
	\x09Mask: 0

	\x09Status: 0
SUPL END received
SUPL session internal resources released
SUPL session finished
Done
\x1B[1;1H\x1B[2JTracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 15

[Martin Lesund]

Hi Yusuke,
Thank you for the feedback on the mistake in the library path, it has been reported internally.

(I have placed the SUPL files accordingly):

Please share the full output log when running the GPS sample, since it seem to be cut OFF before it Tracks any satellites.

Have you compared the time it takes to get GPS fix without the SUPL library enabled vs. not? (you should see a big improvement when using A-GPS)

Where have you placed the external GPS antenna, open space for best results? (make sure you put the physical GPS antenna switch (SW12) to select the external)

There have been some reports with customers having issues getting the data from the SUPL server in your area, we are looking into that. 

Best regards,
Martin L.

[Yusuke]

I showed the log above. Isn't it enough?

[Martin Lesund]

Hi Yusuke,
The Log does not show the GPS tracking (+TTFF), only the SUPL download.

So It's hard to say where it goes wrong based on only that.

[Yusuke]

With SUPL assist

*** Booting Zephyr OS build v2.1.99-ncs1  ***
Flash region            Domain          Permissions
00 0x00000 0x08000      Secure          rwxl
01 0x08000 0x10000      Non-Secure      rwxl
02 0x10000 0x18000      Non-Secure      rwxl
03 0x18000 0x20000      Non-Secure      rwxl
04 0x20000 0x28000      Non-Secure      rwxl
05 0x28000 0x30000      Non-Secure      rwxl
06 0x30000 0x38000      Non-Secure      rwxl
07 0x38000 0x40000      Non-Secure      rwxl
08 0x40000 0x48000      Non-Secure      rwxl
09 0x48000 0x50000      Non-Secure      rwxl
10 0x50000 0x58000      Non-Secure      rwxl
11 0x58000 0x60000      Non-Secure      rwxl
12 0x60000 0x68000      Non-Secure      rwxl
13 0x68000 0x70000      Non-Secure      rwxl
14 0x70000 0x78000      Non-Secure      rwxl
15 0x78000 0x80000      Non-Secure      rwxl
16 0x80000 0x88000      Non-Secure      rwxl
17 0x88000 0x90000      Non-Secure      rwxl
18 0x90000 0x98000      Non-Secure      rwxl
19 0x98000 0xa0000      Non-Secure      rwxl
20 0xa0000 0xa8000      Non-Secure      rwxl
21 0xa8000 0xb0000      Non-Secure      rwxl
22 0xb0000 0xb8000      Non-Secure      rwxl
23 0xb8000 0xc0000      Non-Secure      rwxl
24 0xc0000 0xc8000      Non-Secure      rwxl
25 0xc8000 0xd0000      Non-Secure      rwxl
26 0xd0000 0xd8000      Non-Secure      rwxl
27 0xd8000 0xe0000      Non-Secure      rwxl
28 0xe0000 0xe8000      Non-Secure      rwxl
29 0xe8000 0xf0000      Non-Secure      rwxl
30 0xf0000 0xf8000      Non-Secure      rwxl
31 0xf8000 0x100000     Non-Secure      rwxl
Non-secure callable region 0 placed in flash region 0 with size 32.


SRAM region             Domain          Permissions
00 0x00000 0x02000      Secure          rwxl
01 0x02000 0x04000      Secure          rwxl
02 0x04000 0x06000      Secure          rwxl
03 0x06000 0x08000      Secure          rwxl
04 0x08000 0x0a000      Secure          rwxl
05 0x0a000 0x0c000      Secure          rwxl
06 0x0c000 0x0e000      Secure          rwxl
07 0x0e000 0x10000      Secure          rwxl
08 0x10000 0x12000      Non-Secure      rwxl
09 0x12000 0x14000      Non-Secure      rwxl
10 0x14000 0x16000      Non-Secure      rwxl
11 0x16000 0x18000      Non-Secure      rwxl
12 0x18000 0x1a000      Non-Secure      rwxl
13 0x1a000 0x1c000      Non-Secure      rwxl
14 0x1c000 0x1e000      Non-Secure      rwxl
15 0x1e000 0x20000      Non-Secure      rwxl
16 0x20000 0x22000      Non-Secure      rwxl
17 0x22000 0x24000      Non-Secure      rwxl
18 0x24000 0x26000      Non-Secure      rwxl
19 0x26000 0x28000      Non-Secure      rwxl
20 0x28000 0x2a000      Non-Secure      rwxl
21 0x2a000 0x2c000      Non-Secure      rwxl
22 0x2c000 0x2e000      Non-Secure      rwxl
23 0x2e000 0x30000      Non-Secure      rwxl
24 0x30000 0x32000      Non-Secure      rwxl
25 0x32000 0x34000      Non-Secure      rwxl
26 0x34000 0x36000      Non-Secure      rwxl
27 0x36000 0x38000      Non-Secure      rwxl
28 0x38000 0x3a000      Non-Secure      rwxl
29 0x3a000 0x3c000      Non-Secure      rwxl
30 0x3c000 0x3e000      Non-Secure      rwxl
31 0x3e000 0x40000      Non-Secure      rwxl

Peripheral              Domain          Status
00 NRF_P0               Non-Secure      OK
01 NRF_CLOCK            Non-Secure      OK
02 NRF_RTC0             Non-Secure      OK
03 NRF_RTC1             Non-Secure      OK
04 NRF_NVMC             Non-Secure      OK
05 NRF_UARTE1           Non-Secure      OK
06 NRF_UARTE2           Secure          SKIP
07 NRF_TWIM2            Non-Secure      OK
08 NRF_SPIM3            Non-Secure      OK
09 NRF_TIMER0           Non-Secure      OK
10 NRF_TIMER1           Non-Secure      OK
11 NRF_TIMER2           Non-Secure      OK
12 NRF_SAADC            Non-Secure      OK
13 NRF_PWM0             Non-Secure      OK
14 NRF_PWM1             Non-Secure      OK
15 NRF_PWM2             Non-Secure      OK
16 NRF_PWM3             Non-Secure      OK
17 NRF_WDT              Non-Secure      OK
18 NRF_IPC              Non-Secure      OK
19 NRF_VMC              Non-Secure      OK
20 NRF_FPU              Non-Secure      OK
21 NRF_EGU1             Non-Secure      OK
22 NRF_EGU2             Non-Secure      OK
23 NRF_DPPIC            Non-Secure      OK
24 NRF_GPIOTE1          Non-Secure      OK
25 NRF_REGULATORS       Non-Secure      OK

SPM: NS image at 0xc000
SPM: NS MSP at 0x20027510
SPM: NS reset vector at 0xe909
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.1.99-ncs1  ***
Staring GPS application
Socket created
Getting GPS data...
Tracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 0

Scanning [|] Tracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 0

Scanning [/] New AGPS data requested, contacting SUPL server, flags 59
Established LTE link
ip 4a7d:85c0:: (c0857d4a) port 7276
Starting SUPL session

ULP encoding length: 38
Bytes sent: 38
Bytes received: 34
ULP ossDecode success, choice 3
SUPL response received
ULP encoding length: 57
Bytes sent: 57
Bytes received: 1024
ULP ossDecode more input 4
Bytes received: 1736
ULP ossDecode more input 4
Bytes received: 2124
ULP ossDecode more input 4
Bytes received: 2832
ULP ossDecode more input 4
Bytes received: 3065
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: 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
SUPL POS received
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
Tracking: 0 Using: 0 Unhealthy: 0
Seconds since last fix 16

Scanning [-] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 17

Scanning [\] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 17

Scanning [|] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 18

Scanning [/] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 18

Scanning [-] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 19

Scanning [\] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 19

Scanning [|] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 20

Scanning [/] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 20

Scanning [-] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 21

Scanning [\] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 21

Scanning [|] Tracking: 2 Using: 0 Unhealthy: 0
Seconds since last fix 22

Scanning [/] Tracking: 3 Using: 0 Unhealthy: 0
Seconds since last fix 22

Scanning [-] Tracking: 3 Using: 0 Unhealthy: 0
Seconds since last fix 23

Scanning [\] Tracking: 3 Using: 0 Unhealthy: 0
Seconds since last fix 23

Scanning [|] Tracking: 3 Using: 0 Unhealthy: 0
Seconds since last fix 24

Scanning [/] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 24

Scanning [-] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 25

Scanning [\] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 25

Scanning [|] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 26

Scanning [/] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 26

Scanning [-] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 27

Scanning [\] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 27

Scanning [|] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 28

Scanning [/] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 28

Scanning [-] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 29

Scanning [\] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 29

Scanning [|] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 30

Scanning [/] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 30

Scanning [-] Tracking: 3 Using: 3 Unhealthy: 0
Seconds since last fix 31

Scanning [\] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 31

Scanning [|] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 32

Scanning [/] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 32

Scanning [-] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 33

Scanning [\] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 33

Scanning [|] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 34

Scanning [/] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 34

Scanning [-] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 35

Scanning [\] Tracking: 5 Using: 3 Unhealthy: 0
Seconds since last fix 35

Scanning [|] Tracking: 5 Using: 3 Unhealthy: 0
Seconds since last fix 36

Scanning [/] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 37

Scanning [-] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 37

Scanning [\] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 38

Scanning [|] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 38

Scanning [/] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 39

Scanning [-] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 39

Scanning [\] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 40

Scanning [|] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 40

Scanning [/] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 41

Scanning [-] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 41

Scanning [\] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 42

Scanning [|] Tracking: 4 Using: 3 Unhealthy: 0
Seconds since last fix 42

Scanning [/] Tracking: 4 Using: 4 Unhealthy: 0
Seconds since last fix 43

Scanning [-] Tracking: 4 Using: 4 Unhealthy: 0
Seconds since last fix 43

Scanning [\] Tracking: 4 Using: 4 Unhealthy: 0
Seconds since last fix 0
---------------------------------
Longitude:  ...............

Latitude:   ..............

Altitude:   .............

Speed:      0.207869

Heading:    0.000000

Date:       21-02-2020
Time (UTC): 13:23:20

NMEA strings:
$GPGGA,....................


$GPGLL,...........................


$GPGSA,...................


$GPGSV,.....................


$GPGSV,...................


$GPRMC,.........................


---------------------------------

Without SUPL assist

*** Booting Zephyr OS build v2.1.99-ncs1  ***
Flash region            Domain          Permissions
00 0x00000 0x08000      Secure          rwxl
01 0x08000 0x10000      Non-Secure      rwxl
02 0x10000 0x18000      Non-Secure      rwxl
03 0x18000 0x20000      Non-Secure      rwxl
04 0x20000 0x28000      Non-Secure      rwxl
05 0x28000 0x30000      Non-Secure      rwxl
06 0x30000 0x38000      Non-Secure      rwxl
07 0x38000 0x40000      Non-Secure      rwxl
08 0x40000 0x48000      Non-Secure      rwxl
09 0x48000 0x50000      Non-Secure      rwxl
10 0x50000 0x58000      Non-Secure      rwxl
11 0x58000 0x60000      Non-Secure      rwxl
12 0x60000 0x68000      Non-Secure      rwxl
13 0x68000 0x70000      Non-Secure      rwxl
14 0x70000 0x78000      Non-Secure      rwxl
15 0x78000 0x80000      Non-Secure      rwxl
16 0x80000 0x88000      Non-Secure      rwxl
17 0x88000 0x90000      Non-Secure      rwxl
18 0x90000 0x98000      Non-Secure      rwxl
19 0x98000 0xa0000      Non-Secure      rwxl
20 0xa0000 0xa8000      Non-Secure      rwxl
21 0xa8000 0xb0000      Non-Secure      rwxl
22 0xb0000 0xb8000      Non-Secure      rwxl
23 0xb8000 0xc0000      Non-Secure      rwxl
24 0xc0000 0xc8000      Non-Secure      rwxl
25 0xc8000 0xd0000      Non-Secure      rwxl
26 0xd0000 0xd8000      Non-Secure      rwxl
27 0xd8000 0xe0000      Non-Secure      rwxl
28 0xe0000 0xe8000      Non-Secure      rwxl
29 0xe8000 0xf0000      Non-Secure      rwxl
30 0xf0000 0xf8000      Non-Secure      rwxl
31 0xf8000 0x100000     Non-Secure      rwxl
Non-secure callable region 0 placed in flash region 0 with size 32.


SRAM region             Domain          Permissions
00 0x00000 0x02000      Secure          rwxl
01 0x02000 0x04000      Secure          rwxl
02 0x04000 0x06000      Secure          rwxl
03 0x06000 0x08000      Secure          rwxl
04 0x08000 0x0a000      Secure          rwxl
05 0x0a000 0x0c000      Secure          rwxl
06 0x0c000 0x0e000      Secure          rwxl
07 0x0e000 0x10000      Secure          rwxl
08 0x10000 0x12000      Non-Secure      rwxl
09 0x12000 0x14000      Non-Secure      rwxl
10 0x14000 0x16000      Non-Secure      rwxl
11 0x16000 0x18000      Non-Secure      rwxl
12 0x18000 0x1a000      Non-Secure      rwxl
13 0x1a000 0x1c000      Non-Secure      rwxl
14 0x1c000 0x1e000      Non-Secure      rwxl
15 0x1e000 0x20000      Non-Secure      rwxl
16 0x20000 0x22000      Non-Secure      rwxl
17 0x22000 0x24000      Non-Secure      rwxl
18 0x24000 0x26000      Non-Secure      rwxl
19 0x26000 0x28000      Non-Secure      rwxl
20 0x28000 0x2a000      Non-Secure      rwxl
21 0x2a000 0x2c000      Non-Secure      rwxl
22 0x2c000 0x2e000      Non-Secure      rwxl
23 0x2e000 0x30000      Non-Secure      rwxl
24 0x30000 0x32000      Non-Secure      rwxl
25 0x32000 0x34000      Non-Secure      rwxl
26 0x34000 0x36000      Non-Secure      rwxl
27 0x36000 0x38000      Non-Secure      rwxl
28 0x38000 0x3a000      Non-Secure      rwxl
29 0x3a000 0x3c000      Non-Secure      rwxl
30 0x3c000 0x3e000      Non-Secure      rwxl
31 0x3e000 0x40000      Non-Secure      rwxl

Peripheral              Domain          Status
00 NRF_P0               Non-Secure      OK
01 NRF_CLOCK            Non-Secure      OK
02 NRF_RTC0             Non-Secure      OK
03 NRF_RTC1             Non-Secure      OK
04 NRF_NVMC             Non-Secure      OK
05 NRF_UARTE1           Non-Secure      OK
06 NRF_UARTE2           Secure          SKIP
07 NRF_TWIM2            Non-Secure      OK
08 NRF_SPIM3            Non-Secure      OK
09 NRF_TIMER0           Non-Secure      OK
10 NRF_TIMER1           Non-Secure      OK
11 NRF_TIMER2           Non-Secure      OK
12 NRF_SAADC            Non-Secure      OK
13 NRF_PWM0             Non-Secure      OK
14 NRF_PWM1             Non-Secure      OK
15 NRF_PWM2             Non-Secure      OK
16 NRF_PWM3             Non-Secure      OK
17 NRF_WDT              Non-Secure      OK
18 NRF_IPC              Non-Secure      OK
19 NRF_VMC              Non-Secure      OK
20 NRF_FPU              Non-Secure      OK
21 NRF_EGU1             Non-Secure      OK
22 NRF_EGU2             Non-Secure      OK
23 NRF_DPPIC            Non-Secure      OK
24 NRF_GPIOTE1          Non-Secure      OK
25 NRF_REGULATORS       Non-Secure      OK

SPM: NS image at 0xc000
SPM: NS MSP at 0x20022cb8
SPM: NS reset vector at 0xe485
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.1.99-ncs1  ***
Staring GPS application
Socket created
Getting GPS data...
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---------------------------------
Longitude:  ........

Latitude:   ..........

Altitude:   .........

Speed:      0.191251

Heading:    0.000000

Date:       21-02-2020
Time (UTC): 13:17:03

NMEA strings:
$GPGGA,.......


$GPGLL,.............


$GPGSA,................


$GPGSV,..................


$GPGSV,...................


$GPRMC,.................

>Have you compared the time it takes to get GPS fix without the SUPL library enabled vs. not? 
Yes, there is no difference.

>Where have you placed the external GPS antenna, open space for best results?
I attached the external GPS antenna to connector P29 and slided switch SW12 to CON position.
I placed a DK board to near a window in my room.

[Yusuke]

Ok. It's working.

I tested AGPS in the park under the open sky. I takes 3 to 20 sec to get GPS data.

[Yusuke]

I hope AGPS is available in asset_tracker program too.

[Yusuke]

BTW, with some SIM cards, reading assisted data downloaded from SUPL server fails. At least it fails with Hologram SIM in Tokyo.

SUPL POS received
read again
read again
read error: -1
ULP ossDecode fail 5
SUPL error: 1

[Martin Lesund]

Awesome! 
I am glad to hear that it works.
It would make sense that there would come an update to the Asset tracker with A-GPS support, hopefully, it will come in the near future.