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Kodo-kakaku / luci-app-gpoint

GNSS Information dashboard for OpenWrt LuCi
GNU General Public License v3.0
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Catching ttyUSB changes after modem reboot #27

Open nordeep opened 1 year ago

nordeep commented 1 year ago

Thank you for your work! Set up gpoint on Kroks KNdRt31R19 with Quectel EP06-E. Stuck in the next issue: Modem unexpectedly reboots and side effect is remapping ttyUSB ports to new values. As a result gpoint lost connection with GPS receiver. For now trying to stabilize the modem. But maybe any ideas how to catch changes of ttyUSB for gpoint?

Kodo-kakaku commented 1 year ago

Hi @nordeep ! I have not encountered this behavior of Quectel. I can assume that this problem lies in the vendor applications of Kroks itself. The logic of Gpoint working with a modem is to contact the modem on the AT port in order to send a command to start GNSS, then this data is read from the GNSS port... I wanted to clarify a couple of questions for myself:

Thank you for your feedback and interest in the project!

nordeep commented 1 year ago
  1. Kroks KNdRt31R19 + sim injector Rt-Cse SIM Injector DS(Kroks KNdRt31R16)
  2. Quectel EP06-E firmware - EP06ELAR04A03M4G
  3. Modem behavior is disconnect from USB and connect again. Internet connection also reconnect after modem restarts.
  4. I think yes. For now we are testing modem without GNSS data. Gpoint is disabled for now. We have a discussion with Kroks here - https://4pda.to/forum/index.php?showtopic=994528&st=4320#entry122418164 One of the guess is the unstable PSU.

It has been suggested to use hotplug.d for remap ttyUSB to symlink to let Gpoint/gpsd not to block mapping ttyUSB*

Kodo-kakaku commented 1 year ago

I've been testing Gpoint with the Quectel EP06 modem all day, while overloading it, disconnecting it in an emergency - the ports remained the same. But I remembered that I had encountered similar behavior on another modem and it was caused, in my opinion, by the lack of a sim card. Try to exclude the sim injector, and test the operation without it.

koshev-msk commented 11 months ago

Hi @nordeep! Probably u question does not directly concern the application. I propose to use the script in /etc/hotplug.d/usb/ location to create links of modem ports. See example. Best regards.