u-blox TOBY-R200 Intermittent Long Registration on Simple Connect

[Matthew Starr]

I have a u-blox TOBY-R200 running on an embedded Linux device with the ModemManager 1.8-rc2 build, plus the patch for "ublox: fix 'any' mode building".  On this device there seems to be an issue between the automatic registration of the TOBY-R200 modem and ModemManager reaching the Simple Connect State (5/8) Register.

Between reboots I can get ModemManager to have a quick registration and then have a slow (40 or more seconds) registration, where ModemManager seems to have caught the modem right before it finished auto registration or for some reason a denied state occurs and restarts the entire registration over.  The issue seems to happen right before simple connect state (5/8) Register is run.

Here is what is reported during a quick registration step:
Simple connect state (5/8): Register
Already registered in network 'XXXXXX', automatic registration not launched...

Here is what is reported during a slow registration step:
Simple connect state (5/8): Register
Launching automatic network registration...

See attached files for logs of the fast and slow registration from the start of a simple connect to step (6/8) Bearer

Any idea on what the difference is between the fast and slow registration and what might be causing it?  Any ideas how to fix it?

Best regards,
Matthew Starr


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