Freematics Forum

I cannot get my Freematics One+ Traccar to connect over cellular network. The terminal just prints this over and over again. (I removed the IMEI)

[CELL] Activating...
CELL:SIM7070G
IMEI:XXXXXXX
[CELL] Searching...
APN:hologram

Is there a way to get more debugging information to determine why my device is not connecting to the cellular network?

What's the cellular module's state code (can be found in serial output).

I can confirm this issue. I have not been able to get my Freematics One+ to work with the hologram SIM card. See below for full output. This seems to be the error code for the SIM card not registering[1]. This appears to be happening in CellSIMCOM::setup [2]. Any help on getting this device registered on the the hologram network would be appreciated.

[1] https://community.hologram.io/t/network ... ing/2466/3

[2] https://github.com/stanleyhuangyc/Freem ... 5C1-L276C1

[CELL] Activating...
[BUF] 44 samples | 528 bytes | 22/32
[BUF] 48 samples | 576 bytes | 24/32
CELL:SIM7070G
IMEI:86545605370XXXX <--- obfuscated
[CELL] Searching...
APN:hologram
[BUF] 52 samples | 624 bytes | 26/32
[BUF] 56 samples | 672 bytes | 28/32
[BUF] 60 samples | 720 bytes | 30/32
[BUF] 64 samples | 768 bytes | 32/32
[BUF] 64 samples | 768 bytes | 32/32
[BUF] 64 samples | 768 bytes | 32/32
[BUF] 64 samples | 768 bytes | 32/32

+CGREG: 0,2

OK

+CGREG: 0,2

OK

Just to be sure I double checked building and installing thus using Freematics builder on Windows and received the same result. My sim card is registered in the hologram portal but has not received a connection yet.

A customer reported this issue solved by using a local (non roaming) SIM card first to activate and then hologram sim cards can be registered on the network.

Hi @stanley I want to try a local SIM but I need to provide an APN Username and APN password. I can't see how to do this in the Telelogger v5 code.
Also I tried what was suggested here but it didn't work: viewtopic.php?p=49629&hilit=apn#p49629
Please advise! Thanks

It appears that there is an issue with the Freematics device using the late October 2024 version of code and the 'Hologram' SIM - I think a bit of caution is needed here. I've had the same issue and the suggested advice does not really help.

Network Bands: Ensure your region’s bands match the SIM7070G and Hologram SIM.
I've contacted Hologram and they confirm that their SIM's work in Australia. I've confirmed compatibility with another providers SIM (Belong - a Telstra subsidiary) I'm therefore fairly confident that the relevant bands are available. Better diagnostics from the Freematic device would help but there are no useful available tools to assist.

APN Setup: Confirm APN is set to hologram:
Certainly you can specify this in 'config.h', and the diagnostic output from the device indicates the APN in use. As there are no tools supplied with the Freematics device that allow you to directly interact with the SIM7070G Cellular module to confirm this there are not many ways to independently confirm that the APN is set.

Automatic Registration: Force auto network selection with: AT+COPS=0
I've done this by modifying the code. Once I did this, I started to get "[CELL] No supported module" messages intermittently using a known working SIM so not so good. Going back to the Hologram SIM results again in "+CREG: 0,2" in the devices output. Leaving the device powered down for a while, and then backing out the code change and using a known working SIM did eventually restore service/

Signal Check: Run AT+CSQ to check signal strength. Low signal might be the issue.
As noted above there are no tools to allow you to directly interact with the SIM7070G module so not a helpful suggestion. I have however confirmed previously (before the previous point) that the device can communicate with the mobile network and my mobile phone next to the device (4/5 bars).

Firmware Update: Ensure your SIM7070G firmware is up to date for best compatibility.
As noted above there are no tools that allow you to directly interact with the SIM7070G module so not a helpful suggestion.

Progress to date
I've a support ticket with Hologram but I'm most likely going to close it and cancel the SIM. Given some other issues I am having with the 'telelogger.ino' code and 'traccar' I suspect that there are deeper issues with the code and this could end up becoming a three-way support debate - and life is too short.

If anyone else has a fix or code update they could share that would be great.

Thanks,