Re: iridium: Not getting signal quality, not registered yet

[Aleksander Morgado <aleksander lanedo com>]

Hey,

> tried again to setup a iridium connection but now i get a lot of "Not
> getting signal quality, not registered yet" messages and the connection
> doesn't seem to work at the beginning. after some tries (i think 3x),
> the connection worked. here are the logs:
>
> Are there any problems with this message? and why does the connection
> doesn't work at the beginning? i changed nothing in the setup (anetnna
> position, MM restart,...).

There's no big issue with that message, it just says that until being 
registered you're not able to get signal quality. The "004" in the 
"+CREG:002,004" reply below actually means unknown registration status.

The connection doesn't work right away because possibly you don't have a 
satellite in direct LOS. Specially if you only see part of the sky, 
you'll get either no connection or bad connection. Iridium satellites 
are low-earth-orbiting, so they move quite fast w.r.t ground, and 
handoff between satellites may cause that you lose the connection if the 
new satellite coming to give you coverage is blocked by e.g. a wall or a 
building.

> modem-manager[4232]: <debug> [mm-at-serial-port.c:334] debug_log():
> (ttyS1): --> 'AT+CREG=2<CR>'
> modem-manager[4232]: <debug> [mm-at-serial-port.c:334] debug_log():
> (ttyS1): <-- '<CR><LF>OK<CR><LF>'
> modem-manager[4232]: <debug> [mm-at-serial-port.c:334] debug_log():
> (ttyS1): --> 'AT+CREG?<CR>'
> modem-manager[4232]: <debug> [mm-at-serial-port.c:334] debug_log():
> (ttyS1): <-- '<CR><LF>+CREG:002,004<CR><LF><CR><LF>OK<CR><LF>'
> modem-manager[4232]: <debug> [mm-generic-gsm.c:3192]
> mm_generic_gsm_set_reg_status(): CS registration state changed: 4
> modem-manager[4232]: <debug> [mm-modem-iridium-gsm.c:368]
> get_signal_quality(): Not getting signal quality, not registered yet
> modem-manager[4232]: <debug> [mm-modem-iridium-gsm.c:368]
> get_signal_quality(): Not getting signal quality, not registered yet


--
Aleksander