Problem with cellular connection failing repeatedly #1109
Comments
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In the community www.smart-EMOTION.de reported some user the same issue since #1105 fixed. |
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That's probably not a software issue. The signal level isn't too bad, which is puzzling. I wouldn't exclude an issue with the SIM card / provider. I assume you double checked the SIM's registration & account balance, so try a different SIM card. And try the Hologram SIM in another device, e.g. your mobile phone. Another possible cause is some half broken/lose wire at the antenna connection. Try a different antenna, and check the internal antenna connection ("pigtail cable") running from the connector to the modem. Regards, |
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So, I've done several things to try to troubleshoot as you requested. Sorry for the delay but I got a new SIM card from another provider to ensure that it is not the SIM card itself. I did ensure that my previous provider (hologram) did have registration set up and my account balance was just fine. I put the hologram SIM card into my phone, which worked fine. I put another provider's (verizon) SIM card into my phone, which also worked ok. I put the working Verizon SIM into OVMS and I am not able to register even after changing the APN setting to the correct one (APN: TRACFONE.VZWENTP). I reconnected the pigtails inside and switched to a different cell antenna and no difference. Using the hologram card it still connects one time on power on, but then a few seconds later the PPP session is dropped with NO CARRIER and no further connections are established. If it is a hardware and not a software problem, that's fine, but I wanted to exhaust the software side and know I'm not doing anything wrong on my side of things before I request a replacement. Thanks for any possible insight into my problem. Here are the log entries I see with the new Verizon SIM: D (719679) cellular: mux-rx-line #0 (2/12): OK |
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AFAICT your log says you've got a good cellular signal level (+CSQ), but none of the cellular providers offer to register you (+CREG,+CGREG,+CEREG,+CPSI). Even with a zero balance, I normally see the network registration happen. What bugs me is your modem's reported revision code: That doesn't match my two units, which show The only page I can find on the web mentioning your revision code is another OVMS user's metrics dump, and that also doesn't show a cellular network… |
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Can you also please query the preferred mode & band selection? |
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Thanks for the speedy followup. Here are the results of the commands... |
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That's the correct modem version (7600G = global edition, supports all frequency bands) and mode & band selections are correct as well (auto = allow all). You've got a more recent firmware, but I've meanwhile found other users running that version without any issues. I've run out of ideas for now, except some internal HW issue of your modem/module. |
I have been having issues with the cellular connection failing even in an area where there should be good signal quality.
Environment
Issue
I have been experiencing a problem ever since I received the new OVMS system a month ago. I am using a hologram SIM card and have tried to debug the issue with them, but they were not able to help. It seems that OVMS tries to establish a PPP connection but after establishing the connection 'NO CARRIER' is received and then after that a loop occurs and the connection is not reestablished.
I set 'log level debug cellular' to try to see what's going on, but I don't see anything obvious on my side to know why 'NO CARRIER' happens after it does establish the PPP session sucessfully.
Sample Logs
I am showing a session where I start up the modem (from shut down state) to see the PPP session establishing and then immediately getting a 'NO CARRIER' followed by the looping.
If there are further commands or logs that would help to you (or me) to debug the issue, please let me know.
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