How to turn on/off GPS while LTE is on?

RE: How to turn on/off GPS while LTE is on?

linh — Thu, 27 Feb 2020 12:51:47 GMT

I would like to have the example too

RE: How to turn on/off GPS while LTE is on?

Yusuke — Sun, 20 Oct 2019 07:54:24 GMT

Any update about eDRX+GPS?

RE: How to turn on/off GPS while LTE is on?

Yusuke — Tue, 08 Oct 2019 11:31:06 GMT

Do you know when eDRX+GPS sample program will be released?

RE: How to turn on/off GPS while LTE is on?

Yusuke — Fri, 20 Sep 2019 00:11:55 GMT

Hi stevenlin

>do you rewrite mqtt between gps from udp_gps example?

I'm sorry but I don't get what you mean.

I just try to merge mqttt and gps programs

RE: How to turn on/off GPS while LTE is on?

stevenlin — Tue, 17 Sep 2019 15:52:18 GMT

hi Yusuke

do you rewrite mqtt between gps from udp_gps example?

https://github.com/Rallare/fw-nrfconnect-nrf/tree/nrf9160_samples/samples/nrf9160/udp_gps

RE: How to turn on/off GPS while LTE is on?

Yusuke — Sat, 14 Sep 2019 12:59:24 GMT

Hi, Bjørn Kvaale

This is PSM+GPS function program.

https://github.com/Rallare/fw-nrfconnect-nrf/tree/nrf9160_samples/samples/nrf9160/udp_gps

In current firmware, you can't use eDRX and GPS concurrently, right?

RE: How to turn on/off GPS while LTE is on?

Yusuke — Mon, 12 Aug 2019 03:26:06 GMT

> This parameter can then be found in ui_evt_handler where you can see that you need to press UI_BUTTON_1 for at least 5 sec...

I got it.

> 8.b. This actually has happened for me as well on ccasion. It has even happened that the first fix works, but that the GPS doesn't start the second time. I also tend to loose the cloud connection regulalrly. I then reboot the DK and then it works. quite annoying, but I haven't figured out why these things happen.

I set SW2 to N.C. and SW1 to GND, but I don’t get GPS data.

Starting GPS
gps_work_handler starts
Enabling PSM
PSM enabled
[00:00:31.946,197] <dbg> nrf9160_gps.enable_gps: GPS mode is enabled
[00:00:31.953,613] <dbg> nrf9160_gps.enable_gps: Functional mode: 1
[00:00:31.960,937] <dbg> nrf9160_gps.start: GPS socket created
[00:00:31.971,588] <dbg> nrf9160_gps.start: GPS operational
GPS started successfully.
Searching for satellites to get position fix. This may take several minutes.
The device will attempt to get a fix for 360 seconds, before the GPS is stopped.
GPS operation started

<no output for several minutes>

[00:06:31.703,186] <dbg> nrf9160_gps.stop: Stopping GPS
GPS operation was stopped
The device will try to get fix again in 30 seconds
Enabling PSM
PSM enabled
[00:07:02.727,264] <dbg> nrf9160_gps.enable_gps: GPS mode is enabled
[00:07:02.734,863] <dbg> nrf9160_gps.enable_gps: Functional mode: 1
[00:07:02.746,124] <dbg> nrf9160_gps.start: GPS operational
GPS started successfully.
Searching for satellites to get position fix. This may take several minutes.
The device will attempt to get a fix for 360 seconds, before the GPS is stopped.
GPS operation started

> One thing you get is the POLLHUP socket error when the GPS is stopped. This I have never seen.

I solved this issue. iBass SIM seems to cut the connection every 5 minutes in the place where I live.. I knew this issue from before. I replaced it with a LTE-M SIM of another carrier and this issue disappeared. You said “I also tend to loose the cloud connection regulalrly.” I recommend you to try another SIM.

> For me, debugging is complicated by the fact that I cannot be indoors when testing the GPS.

The real-GPS asset_tracker is not officially released and so it might have some bugs. I will wait for its official release because it’s a hard job to debug unofficial program for my skill level....

RE: How to turn on/off GPS while LTE is on?

pemar13 — Sun, 11 Aug 2019 17:45:59 GMT

Hi Yusuke,

Yes I use commit #943.

8.a. Well, maybe there is some easy to find info about the need to start the GPS by long-pressing button 1, but I found out by looking at Kconfig in src\gps_controller, which contains the config GPS_CONTROL_ON_LONG_PRESS. This parameter can then be found in ui_evt_handler where you can see that you need to press UI_BUTTON_1 for at least 5 sec...

8.b. This actually has happened for me as well on ccasion. It has even happened that the first fix works, but that the GPS doesn't start the second time. I also tend to loose the cloud connection regulalrly. I then reboot the DK and then it works. quite annoying, but I haven't figured out why these things happen.

I assume you have kept CONFIG_NRF9160_GPS_LOG_LEVEL_DBG=y, which is necessary for the togging of the GPS activity.

Also, I think you must set SW2 to N.C. (see gps_trigger_handler() which checks UI_SWITCH_2). I have SW1 set to GND, but I don't think this matters for anything else than pairing.

One thing you get is the POLLHUP socket error when the GPS is stopped. This I have never seen.

For me, debugging is complicated by the fact that I cannot be indoors when testing the GPS. I must be outdoors to get good enough signals, but it's raining quite a lot...

RE: How to turn on/off GPS while LTE is on?

Yusuke — Sun, 11 Aug 2019 13:40:29 GMT

Hi Per. You are awesome!

> 8. a. After long-pressing button 1 (5 sec), the console shows
I got the same result.

>Maybe a silly question, but have you long-pressed button 1 to start the GPS?
Where is this described?

> 8.b. After some additional about 15 seconds
I can't get the same result. There is no output and rebooted after several minutes.

This is my output. I don't see any GPS data on nRF Connect while other simulated data is updated.
Can you tell me the setting of SW1 and SW2?

Do you use #943 commit?

Starting GPS
gps_work_handler starts
Enabling PSM
PSM enabled
[00:00:31.946,197] <dbg> nrf9160_gps.enable_gps: GPS mode is enabled
[00:00:31.953,613] <dbg> nrf9160_gps.enable_gps: Functional mode: 1
[00:00:31.960,937] <dbg> nrf9160_gps.start: GPS socket created
[00:00:31.971,588] <dbg> nrf9160_gps.start: GPS operational
GPS started successfully.
Searching for satellites to get position fix. This may take several minutes.
The device will attempt to get a fix for 360 seconds, before the GPS is stopped.
GPS operation started

<no output for several minutes>

[00:06:32.002,258] <dbg> nrf9160_gps.stop: Stopping GPS
GPS operation was stopped
The device will try to get fix again in 30 seconds
Socket error: POLLHUP
Reboot
***** Booting Zephyr OS build v1.14.99-ncs2-495-ga8933a2ead01 *****
[00:00:00.005,706] <inf> mcuboot: Starting bootloader
[00:00:00.012,176] <inf> mcuboot: Primary image: magic=unset, copy_done=0x3, image_ok=0x3
[00:00:00.020,935] <inf> mcuboot: Scratch: magic=unset, copy_done=0x50, image_ok=0x3
[00:00:00.029,235] <inf> mcuboot: Boot source: primary slot

RE: How to turn on/off GPS while LTE is on?

pemar13 — Sun, 11 Aug 2019 11:41:40 GMT

lHi!

Maybe a silly question, but have you long-pressed button 1 to start the GPS?

My experience is as follows (sorry for the rather lengthy comment):

1. I have used both Windows 10 x64 and on MacOS Mojave.

2. I can build joakim's asset_tracker and program the DK v0.8.5 on both platforms. I had problems getting west to work properly on the Mac, but succeeded eventually by using the west and nrf folder from ncs on Windows. Strange, but...

3. Building in Mojave is about 2-3 times faster than in Windows (same PC that can boot either of the platforms). Also, in Mojave programming the DK 8i.e., download Zephyr/Merged hex) works every time whereas it fails every secobnd time in Windows (resulting in an error message about a "Generic error").

4. I have had the same results using Cat-M1 or NB-IoT (have access to both where I am), but when "switching" between the two in either direction always requires a more elaborate procedure rebooting the DK twice before an LTE connection can be established. With switching I mean building the app with a new setting for CONFIG_LTE_NETWORK_MODE_NBIOT and reprogramming the board.

5. Independent of platform, I must set CONFIG_NRF_CLOUD_PROVISION_CERTIFICATES=y and provide a certificates file. mI f not, I get a socket error and the DK reboots:

Connecting to LTE network. This may take several minutes.
[00:00:06.437,164] .[0m<dbg> lte_lc.at_handler: recv: +CEREG: 2,"0485","018A7412",9
.[0m
[00:00:07.029,296] .[0m<dbg> lte_lc.at_handler: recv: +CEREG: 1,"0485","018A7412",9
.[0m
Connected to LTE network
[00:00:07.296,142] .[0m<dbg> nrf_cloud_transport.nct_connect: IPv4 Address 0xfc8dcb34.[0m
Socket error: POLLHUP
LTE link disconnect
Shutdown modem

6. Apart from the setting for CONFIG_LTE_NETWORK_MODE_NBIOT and the provisioning, I use the proj.conf as provided.

7. After starting the app, I get similar console output as above, and then simulated environment data appears on the nrfcloud.com web page while the GPS map shows "Waiting for GPS data...".

8. a. After long-pressing button 1 (5 sec), the console shows

Starting GPS
Enabling PSM
PSM enabled
[00:12:03.735,137] .[0m<dbg> nrf9160_gps.enable_gps: GPS mode is enabled.[0m
[00:12:03.742,492] .[0m<dbg> nrf9160_gps.enable_gps: Functional mode: 1.[0m
[00:12:03.749,572] .[0m<dbg> nrf9160_gps.start: GPS socket created.[0m
[00:12:03.760,162] .[0m<dbg> nrf9160_gps.start: GPS operational.[0m
GPS started successfully.
Searching for satellites to get position fix. This may take several minutes.
The device will attempt to get a fix for 360 seconds, before the GPS is stopped.
GPS operation started

8.b. After some additional about 15 seconds

[00:12:23.344,726] .[0m<dbg> nrf9160_gps.print_satellite_stats: Tracking: 0 Using: 0 Unhealthy: 0.[0m
[00:12:23.353,973] .[0m<dbg> nrf9160_gps.print_satellite_stats: Seconds since last fix 743.[0m
[00:12:23.362,487] .[0m<dbg> nrf9160_gps.print_satellite_stats: Tracking: 0 Using: 0 Unhealthy: 0.[0m
[00:12:23.371,582] .[0m<dbg> nrf9160_gps.print_satellite_stats: Seconds since last fix 743.[0m
...

8.c. If the GPS gets a fix (for me this requires a quite "open" location with very few surrounding "obstacles" like buildings), the console indicates that GPS and PSM are stopped/disabled and the GPS position and the simulated environment data is updated on the web page.

If the GPS doesn't get a fix, the consoleindicates that GPS and PSM are stopped/disabled and only the simulated environment data is updated on the web page.

8.d After a 30 sec delay the GPS starts again and the above is repeated

I wish there was more info from Nordic about how things should be done. My aim is similar to yours: Get rid of the simulated sensor and nRF Cloud stuff and switch between LTE and GPS and send GPS data to our own AWS using MQTT.

Best regards, Per

RE: How to turn on/off GPS while LTE is on?

Yusuke — Sat, 10 Aug 2019 07:49:42 GMT

Hi, everyone. Thank you for helping.

I've successfully built the real-GPS asset_tracker, but I'm stucked in another issue.

What I did is
on Windows10 64bit
- uninstall west and install it again.
- change the place of the source code root folder. Previously I put it in C:\Users\<username>\Documents\nRF9160. Now I put it in C:\Users\user1\nRF9160.
"nRF9160" is source code root folder.
- make a ncs folder from scratch according to Get Started Assistant
- pull real-GPS asset_tracker

With this procedure, build works out.

I did the same thing on Mac but it still causes error.

Another issue: I fixed prj.conf and certificates.h in real-GPS asset_tracker and then it was successfully build and downloaded to DK. However, I can't get GPS data. gps project works fine with my DK v0.8.5. The DK seems to be connected to nRF Cloud while the asset_tracker is working. Some values of simulated temperature and so on are being updated, but no GPS data is received.

Also how can you tell if the asset_tracker program is using PSM?

Any advice?

<prj.conf>
.
.
.
# Overwrite these
# "10000001" : 30 sec x 1 => 30 sec/shot
CONFIG_LTE_PSM_REQ_RPTAU="10000001"
# "00000101" : 2 sec x 5 => 10 sec stanby time
CONFIG_LTE_PSM_REQ_RAT="00000101"

# Add this
CONFIG_NRF_CLOUD_PROVISION_CERTIFICATES=y

this is a output of asset_tracker.

***** Booting Zephyr OS build v1.14.99-ncs2-495-ga8933a2ead01 *****
[00:00:01.769,378] <dbg> nrf9160_gps.init: MAGPIO set: AT%XMAGPIO=1,0,0,1,1,1574,1577
Asset tracker started
[00:00:01.779,846] <dbg> nrf_cloud_transport.nct_client_id_get: client_id = nrf-352656100218455
[00:00:01.789,123] <dbg> nrf_cloud_transport.nct_topics_populate: shadow_base_topic: $aws/things/nrf-352656100218455/shadow
[00:00:01.800,872] <dbg> nrf_cloud_transport.nct_topics_populate: accepted_topic: $aws/things/nrf-352656100218455/shadow/get/accepted
[00:00:01.813,507] <dbg> nrf_cloud_transport.nct_topics_populate: rejected_topic: $aws/things/nrf-352656100218455/shadow/get/rejected
[00:00:01.826,110] <dbg> nrf_cloud_transport.nct_topics_populate: update_delta_topic: $aws/things/nrf-352656100218455/shadow/update/delta
[00:00:01.839,111] <dbg> nrf_cloud_transport.nct_topics_populate: update_topic: $aws/things/nrf-352656100218455/shadow/update
[00:00:01.851,013] <dbg> nrf_cloud_transport.nct_topics_populate: shadow_get_topic: $aws/things/nrf-352656100218455/shadow/get
[00:00:02.340,332] <dbg> nrf_cloud_transport.nct_provision: nrf_inbuilt_key_delete(16842753, 0) => result=0
[00:00:02.810,760] <dbg> nrf_cloud_transport.nct_provision: nrf_inbuilt_key_delete(16842753, 1) => result=0
[00:00:03.262,451] <dbg> nrf_cloud_transport.nct_provision: nrf_inbuilt_key_delete(16842753, 2) => result=0
[00:00:03.709,228] <dbg> nrf_cloud_transport.nct_provision: nrf_inbuilt_key_delete(16842753, 3) => result=2
[00:00:04.157,043] <dbg> nrf_cloud_transport.nct_provision: nrf_inbuilt_key_delete(16842753, 4) => result=2
Connecting to LTE network. This may take several minutes.
[00:00:08.272,308] <dbg> lte_lc.at_handler: recv: +CEREG: 2,"1677","02C75401",7

[00:00:12.765,472] <dbg> lte_lc.at_handler: recv: +CEREG: 5,"1677","02C75401",7

Connected to LTE network
[00:00:13.129,913] <dbg> nrf_cloud_transport.nct_connect: IPv4 Address 0x657bdd03
[00:00:18.857,055] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_CONNACK
[00:00:18.865,295] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 2
[00:00:18.873,077] <dbg> nrf_cloud.event_handler: NRF_CLOUD_EVT_TRANSPORT_CONNECTED
CLOUD_EVT_CONNECTED
[00:00:18.883,178] <dbg> nrf_cloud_transport.nct_cc_connect: nct_cc_connect
[00:00:18.891,754] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 3
[00:00:19.377,990] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_SUBACK: id=1234 result=0
[00:00:19.387,756] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 4
[00:00:19.395,538] <dbg> nrf_cloud_transport.nct_cc_send: mqtt_publish: id=5678 opcode=0 len=0
[00:00:19.405,822] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 5
[00:00:19.829,132] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_PUBACK: id=5678 result=0
[00:00:19.838,867] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 5
[00:00:19.915,069] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_PUBLISH: id=1 len=993
[00:00:19.930,786] <dbg> nrf_cloud_transport.nct_dc_endpoint_set: nct_dc_endpoint_set
[00:00:19.939,331] <dbg> nrf_cloud_transport.nct_dc_endpoint_get: nct_dc_endpoint_get
[00:00:19.948,883] <dbg> nrf_cloud_transport.nct_cc_send: mqtt_publish: id=7890 opcode=1 len=255
[00:00:19.959,320] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 12
[00:00:19.967,193] <dbg> nrf_cloud.event_handler: NRF_CLOUD_EVT_USER_ASSOCIATED
CLOUD_EVT_PAIR_DONE
[00:00:20.810,119] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_PUBACK: id=7890 result=0
[00:00:20.819,854] <dbg> nrf_cloud_transport.nct_dc_connect: nct_dc_connect
[00:00:20.828,308] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 13
[00:00:21.277,191] <dbg> nrf_cloud_transport.nct_mqtt_evt_handler: MQTT_EVT_SUBACK: id=8765 result=0
[00:00:21.286,956] <dbg> nrf_cloud.nfsm_set_current_state_and_notify: state: 14
[00:00:21.294,830] <dbg> nrf_cloud.event_handler: NRF_CLOUD_EVT_READY
CLOUD_EVT_READY
GPS initialized
<no output after GPS initialized>

RE: How to turn on/off GPS while LTE is on?

pemar13 — Thu, 08 Aug 2019 07:10:21 GMT

Hi!

Sorry for jumping in, but I am also struggeling with the nRF9160 with GPS.

I wanted to say that I can build and run joakim's asset_tracker following the same Yusuke's steps (strarting with ncs 1.0.0, fetch and checkout joakim, west update) adding (?) the pip commands to install (upgrade) the requirements on zephyr, nrf, and mcuboot.

I build for the nrf9160_pca10090 in Windows 10 x64 using SES 4.18 Nordic, and run on DK version 0.8.5.

However, I don't get the GPS to lock in open area within 15 min... The GPS seems to work ok.

Best regards, Per

RE: How to turn on/off GPS while LTE is on?

Yusuke — Wed, 07 Aug 2019 16:20:56 GMT

Thank you so much for your help!!

This is build output.

devzone.nordicsemi.com/.../build_5F00_nrf9160_5F00_pca10090ns.zip

build condition.

- on Mac
- nrf: v1.0.0
- project: real-GPS asset_tracker
- SES: v4.16

RE: How to turn on/off GPS while LTE is on?

Carl Richard — Wed, 07 Aug 2019 08:53:25 GMT

Could you provide the CMAKE output? 🙂

RE: How to turn on/off GPS while LTE is on?

Yusuke — Wed, 07 Aug 2019 07:40:08 GMT

Yes, I do. I did it twice

https://github.com/NordicPlayground/fw-nrfconnect-nrf/pull/943

Follow these steps:

Open nRF Connect for Desktop v3, update the Getting Started Guide app
Follow steps there & checkout the v1.0.0 of NCS
Then, run the following commands:

cd ncs/nrf
git fetch origin pull/943/head:joakim
git checkout joakim
west update <1st time>
cd .. (change directory to ncs folder)
west update <2nd time>

RE: How to turn on/off GPS while LTE is on?

Carl Richard — Wed, 07 Aug 2019 07:32:03 GMT

Did you run "west update" after switching to the "real-GPS program"?

RE: How to turn on/off GPS while LTE is on?

Yusuke — Wed, 07 Aug 2019 04:46:15 GMT

I tried the real-GPS asset_tracker on different Windows10(64bit) PC.

python: v3.7.2
SES: v4.18
nrf tag: v1.0.0
GNU toolchain: 7-2018-q2-update

It also causes an error. I set up ncs folder from scratch.

.
.
.
Building ‘spm/zephyr/modules/nrfxlib/nrf_security/src/mbedtls/libspm_mbedcrypto_vanilla.a’ from solution ‘build’ in configuration ‘Common’
1> Compiling ‘memory_buffer_alloc.c’
2> Compiling ‘pkparse.c’
3> Compiling ‘pkwrite.c’
4> Compiling ‘platform.c’
5> Compiling ‘pkcs5.c’
6> Compiling ‘poly1305.c’
7> Compiling ‘platform_util.c’
8> Compiling ‘ripemd160.c’
1> C:/Users/yusuke.fukuhara/Documents/nRF9160/ncs/mbedtls/library/memory_buffer_alloc.c:606:1: fatal error: opening dependency file C:/Users/yusuke.fukuhara/Documents/nRF9160/ncs/nrf/applications/asset_tracker/build_nrf9160_pca10090ns/spm\zephyr\modules\nrfxlib\nrf_security\src\mbedtls\CMakeFiles\spm_mbedcrypto_vanilla.dir\C_\Users\yusuke.fukuhara\Documents\nRF9160\ncs\mbedtls\library\memory_buffer_alloc.c.obj.d: No such file or directory
1> compilation terminated.
Build failed

Both on Mac and Windows10, symptom is similar.

The asset_tracker can be built before fetching the real-GPS program, but after that it causes an error when it's built.

RE: How to turn on/off GPS while LTE is on?

stevenlin — Wed, 07 Aug 2019 04:01:28 GMT

[quote userid="76479" url="~/f/nordic-q-a/49559/how-to-turn-on-off-gps-while-lte-is-on/202713"]data upon[/quote]

hi Yusuke,

i mean the nrf9160 Hardware build code .

for my environment ，ses 4.18, nrf91 hw,0.8.5

it can build success.

you should check the other tools(python3.7 and jlink software tool version)

RE: How to turn on/off GPS while LTE is on?

Yusuke — Wed, 07 Aug 2019 00:21:58 GMT

hmmm. Let me confirm if I understand correctly.

>it just needs the Firmware for the asset_tracker application to be updated to handle real data over the simulated data upon which the original asset_tracker application was built.

Does this mean the DK does not work only by choosing PCA10090 and building the real- GPS asset_tracer program without modification? You need to fix some code in the asset_tracker for PCA10090, don't you?

RE: How to turn on/off GPS while LTE is on?

MJD093 — Tue, 06 Aug 2019 16:42:46 GMT

Well that's not accurate. That pull request added real GPS usage AND PCA20035 support to the asset_tracker application.

It should be possible to use that with the generic PCA10090 DK but you need to build it for the PCA10090. The PCA10090 is more than capable of using real GPS data, it just needs the Firmware for the asset_tracker application to be updated to handle real data over the simulated data upon which the original asset_tracker application was built.

RE: How to turn on/off GPS while LTE is on?

Yusuke — Tue, 06 Aug 2019 16:36:18 GMT

I really appreciate your clear explanation!

It's not written anywhere on the Nordic website sadly.

OK. so the this pull request is useless for nRF9160 DK board and you need to use it with Thingy:91.

Many thanks!!

RE: How to turn on/off GPS while LTE is on?

MJD093 — Tue, 06 Aug 2019 16:17:54 GMT

Ok. Just to clear the situation.

PCA###### is Nordic's board designator to distinguish different development kits from one another, the nRF#### part is the chip on the PCB. In this particular case:

nRF9160_pca10090 is the Development Kit PCB which links the device tree files for the nRF9160 SiP

nRF52840_pca10090 is the Development Kit PCB which links the device tree files for the nRF52840 SoC

nRF9160_pca20035 is the Thingy:91 PCB which links the device tree files for the nRF9160 SiP

nRF52840_pca20035 is the Thingy:91 PCB which links the device tree files for the nRF52840 SoC

It sounds like you are trying to run the device tree files for the PCA20035 (the Thingy:91 device) on the PCA10090 (the nRF9160 DK). This will cause issues.

RE: How to turn on/off GPS while LTE is on?

Yusuke — Tue, 06 Aug 2019 12:28:48 GMT

Awesome!

I could build the project, but the program stops after that.

1. Fetch asset_tracker with real GPS as Bjorn describes
2. Copy nrf9160_pca20035 to arm folder as MID093 describes
3. sudo open SES v4.18 on Mac
4. Build > Build and run
=> building and downloading are successful, but the program stops.

SPM: NS image at 0xc000
SPM: NS MSP at 0x20020610
SPM: NS reset vector at 0xd309
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS v1.14.99-ncs2 *****

Does this mean nrf9160_pca20035 isn't suitable for DK v0.8.5?

What does the numbering of nrf9160_pca*** mean?

Also, I only built it on SES v4.16 and got an error.

RE: How to turn on/off GPS while LTE is on?

MJD093 — Tue, 06 Aug 2019 08:45:33 GMT

see /path/to/ncs/nrf/boards/arm/ for the pca20035 device tree files. Move them to /path/to/zephyr/boards/arm/ and you can use them as normal.

RE: How to turn on/off GPS while LTE is on?

Yusuke — Mon, 05 Aug 2019 16:26:48 GMT

I see. I see. The asset_tracker supporting real-GPS is only for later version of nrf9160_pca20035. In my case, I find only nrf9160_pca10090 in the folder of <root>/ncs/zephyr/boards/arm.

Thingy:91 might be suitable to use the asset_tracker
https://devzone.nordicsemi.com/f/nordic-q-a/50457/thingy-91/201867

nrf9160_pca20035 board

Removed support for earlier hardware versions of nrf52840_pca20035 and nrf9160_pca20035. From now on, only the latest hardware version is supported.
Removed configurations specific to the deprecated board versions from the asset_tracker application.