From andreas at kemnade.info  Thu Sep 10 10:01:35 2026
From: andreas at kemnade.info (Andreas Kemnade)
Date: Thu, 10 Sep 2026 10:01:35 +0200
Subject: [LetuxOS] Cell broadcast messages on the gta04
In-Reply-To: <20240912122840.72a62981@akair>
References: <20240911101117.4313cc41@akair>
 <2A123D24-706A-4369-BF8E-982D639261FF@goldelico.com>
 <F6553596-3625-4969-B4A6-A10CE0E0CE7C@vanille.de>
 <20240912113403.0927747a@akair>
 <3E4FA3D1-5B0D-4C0B-AE1B-9EAB2D00EA8D@goldelico.com>
 <20240912122840.72a62981@akair>
Message-ID: <20260910100135.7796f8b2@kemnade.info>

On Thu, 12 Sep 2024 12:28:40 +0200
Andreas Kemnade <andreas at kemnade.info> wrote:

> 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 Ger?te k?nnen - jeweils zu einem gewissen Teil -
> sind Alarmsysteme. Mein Nexus 5X abonniert z.B. die Kan?le
> 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. F?r
> Level 4 w?re ein Update n?tig."
> 
> more background seems to be on
> https://www.etsi.org/deliver/etsi_ts/123000_123099/123041/18.05.00_60/ts_123041v180500p.pdf
> 
any updates on commands to try?

Regards,
Andreas