/usr/bin/lc15bts-mgr can't find GPS 3D fix to for calibration - OpenBSC

22 Nov 2017


      Hi,
We have a Litecell 1.5 unit. It is updated to the latest packages on the nightly build and configured to an osmo-bsc set up on an another machine.
On mobile phones, the network does not show the short or long name set, instead it shows just numbers "09070" and calls can not be made.
This has happened to us before when there was problem with the clock calibration on the BTS.
A GPS device is attached to the BTS, and when running cgps, there is a 3D Fix and a correct GPS location coordinates show up.
The lc15 bts should be able to calibrate automatically using the lc15bts-mgr package, however, it seems like it is failing to do so.
When we tried stopping the lc15bts-mgr service and start it manually to log the output by running:
/usr/bin/lc15bts-mgr -s -c /etc/osmocom/lc15bts-mgr.cfg
We notice the following errors:
```
Failed to open /mnt/storage/var/run/lc15bts-mgr/volt-supply-max due to 'No such file or directory' error
<0000> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_misc.c:315 Total hours of Operation: 393
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:271 Going to calibrate the system.
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:121 Last GPS 3D fix can not read (-2). Last GPS 3D fix sets to zero
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:126 GPS has no fix
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:126 Going to check for watchdog notification.
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:67 Missing watchdog events: e:0x000000000000002e,m:0x000000000000007f
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:126 Going to check for watchdog notification.
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:67 Missing watchdog events: e:0x000000000000002f,m:0x000000000000007f
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:271 Going to calibrate the system.
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:121 Last GPS 3D fix can not read (-2). Last GPS 3D fix sets to zero
<0003> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_mgr_calib.c:126 GPS has no fix
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:126 Going to check for watchdog notification.
<0004> ../../../git/src/osmo-bts-litecell15/misc/lc15bts_swd.c:67 Missing watchdog events: e:0x000000000000002f,m:0x000000000000007f
```
It seems the lc15bts_mgr service can not read the values from the GPS device for some reason, can someone please advise what might be causing this issue?
Best Regards,
Rayan