[LetuxOS] Cell broadcast messages on the gta04

[Andreas Kemnade]

Am Thu, 12 Sep 2024 12:03:59 +0200
schrieb "H. Nikolaus Schaller" <hns at goldelico.com>:

> Hi,
> 
> > Am 12.09.2024 um 11:34 schrieb Andreas Kemnade
> > <andreas at kemnade.info>:
> > 
> > Hi,
> > 
> > Am Wed, 11 Sep 2024 11:38:15 +0200
> > schrieb "Dr. Michael 'Mickey' Lauer" <mickey at vanille.de>:
> >   
> >> A quick check on the ancient freesmartphone code as per
> >> https://github.com/freesmartphone/cornucopia/blob/master/fsogsmd/src/lib/at/atcbmediators.vala
> >> leads to AT+CSCB=[<mode>[,<mids>[,<dcss>]]] being the standard
> >> command.
> >>   
> > so ignore(1) nothing("","") does not work
> > 
> > AT+CSCB=1,"",""    
> > ERROR
> > 
> > AT+CSCB?
> > +CSCB: 0,
> > "0,199,299,4352-4356,4370,4383,4356,4352-4354,4370-4379,4383-4392",""
> > 
> > OK
> > 
> > so bootup some list of selected channels is received, tried to
> > extend that
> > AT+CSCB=0, "0-99,100-199,200-999,1000-9000",""
> > OK
> > 
> > Now I had
> > AT+CSCB?
> > +CSCB: 0,
> > "0,199,299,4352-4356,4370,4383,4356,4352-4354,4370-4379,4383-4392,0-99,100-199,200-999,1000-9000","" 
> > 
> > OK
> > 
> > But silence at 11 o'clock both on ttyHS_Modem and Application.
> > 
> > AT+CSCB=?
> > +CSCB: (0-1)
> > 
> > OK
> > 
> > so this suggests that only simple one parameter calls are accepted.
> > AT+CSCB=1
> > OK
> > AT+CSCB?
> > +CSCB: 1, "4370,4370-4379,1000-9000",""
> > 
> > OK
> > AT+CSCB=0
> > OK
> > AT+CSCB?
> > +CSCB: 0, "0-4369,4371-65535,4370,4370-4379,1000-9000",""
> > 
> > OK
> > 
> > I have seen the other commands too late, so I can only check setup
> > AT+CNMI?
> > +CNMI: 2,2,2,0,0
> > 
> > 
> > OK
> > 
> > so things should be received. I had added that command to simple-gsm
> > last time.
> > 
> > @@ -49,7 +49,7 @@ class GSMModem : Object {
> >   bool calling;
> >   bool seen_call_state;
> >   string oldline;
> > -  string [] unsoc_init =
> > {"AT+CLIP=1","AT+CREG=2","AT+CSQ","AT+CTZU=1","AT+CREG?"};
> > +  string [] unsoc_init =
> >  {"AT+CLIP=1","AT+CREG=2","AT+CSQ","AT+CTZU=1","AT+CREG?","AT+CNMI=2,2,2,0,0"};
> >   
> 
> Thanks for giving this a try!
> 
> Well, now we have to wait another year (second Thursday in September,
> i.e. 11th in 2025).
> 
> Or find someone with a private network base station and control
> software to trigger CBC on demand. Harald Welte maybe?
> 
or find someone living near the Austrian border. Maybe the flood
will bring some input...

interesting:
https://hilfe.o2online.de/mobilfunkdienste-telefonie-internet-messaging-mehr-22/cell-broadcast-auf-kanal-221-inaktiv-597807
Quoting:
"Was aber alle drei Geräte können - jeweils zu einem gewissen Teil -
sind Alarmsysteme. Mein Nexus 5X abonniert z.B. die Kanäle
4354,4355,4356,4370,4372,4378,4379,4382,4383,4385,4391,4392,4395 und
kann damit CMAS / EU-Alert Level 1-3, aber z.B. nicht Level 4. Für
Level 4 wäre ein Update nötig."

more background seems to be on
https://www.etsi.org/deliver/etsi_ts/123000_123099/123041/18.05.00_60/ts_123041v180500p.pdf

Regards,
Andreas