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<body><div>Hey Michael</div><div><br></div><div>Thanx for the help :-)</div><div><br></div><div>The AT commands are working now, but as expected no connection at all. So also no fallback to 2g. Or no GPRS offered on 2g ...</div><div><br></div><div>Here some (German) information on the "site lite" transmitters:</div><div><br></div><div><a href="https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152">https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152</a></div><div><br></div><div>I also did not find any AT command for the SIM5360 to force 2g. I will play a bit around with the modem in the next days. Will also try congstar, I do have a congstar SIM laying around here ...</div><div><br></div><div>Greetinx</div><div><br></div><div>Chris</div><div><br></div><div><br></div><div>Am Sonntag, den 02.08.2020, 10:59 +0200 schrieb Michael Balzer:</div><blockquote type="cite">
Chris,<br>
<br>
how to send modem commands and read the responses:<br>
<br>
<tt>OVMS# log level debug simcom</tt><tt><br>
</tt><tt>Logging level for simcom set to debug</tt><tt><br>
</tt><tt>OVMS# simcom cmd AT+COPS?</tt><tt><br>
</tt><tt>SIMCOM command has been sent.</tt><tt><br>
</tt><tt>D (164488782) simcom: tx mcmd ch=4 len=10 : AT+COPS?</tt><tt><br>
</tt><tt>D (164488792) simcom: rx line ch=4 len=23 : +COPS:
0,0,"congstar",2</tt><tt><br>
</tt><tt>D (164488802) simcom: rx line ch=4 len=2 : OK</tt><br>
<br>
Now let's see if we have 3G:<br>
<br>
<tt>OVMS# simcom cmd AT+CPSI?</tt><tt><br>
</tt><tt>SIMCOM command has been sent.</tt><tt><br>
</tt><tt>D (164693462) simcom: tx mcmd ch=4 len=10 : AT+CPSI?</tt><tt><br>
</tt><tt>D (164693482) simcom: rx line ch=4 len=85 : +CPSI:
WCDMA,Online,262-01,0x16C3,7824927,WCDMA IMT
2000,454,10836,0,7.5,104,18,8,500</tt><tt><br>
</tt><tt>D (164693482) simcom: rx line ch=4 len=2 : OK</tt><br>
<br>
Yes. Well, no surprise, Telekom network :-).<br>
<br>
The SIM5360 is supposed to automatically fall back to 2G if 3G isn't
available. On a quick browse through the manual, I didn't find a
command to force 2G, just one to lock to a specific 2G cell… you
could do that depending on your location, but maybe you should first
inspect your modem status now.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 02.08.20 um 09:39 schrieb Chris van
der Meijden:<br>
</div>
<blockquote type="cite" cite="mid:1596353995.7318.1.camel@arachnon.de">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div>Hi all</div>
<div><br>
</div>
<div>I'm trying to understand some principals of the SIM
connection methods of OVMS.</div>
<div><br>
</div>
<div>Reason is that I recently moved from "the big city" Munich to
the very much rural village Thalham. In Thalham we have so
called "lite" mobile transmitters. These transmitters are
installed, as far as I understood, to safe money and to prepare
the transition of the providers to 4g / 5g. They are forcing the
frequencies towards the 4g band with those.</div>
<div><br>
</div>
<div>So these transmitters seem to offer only 2g and 4g, but no
more 3g (really ???).</div>
<div><br>
</div>
<div>I don't have any network connection with the SIM in my OVMS
here in Thalham. In the next village Zolling I have connection.
In Zolling they don't have the "lite" transmitters, but still
have full 3g support. The antenna of my OVMS is working well
(-100 dBm to -70 dBm).</div>
<div><br>
</div>
<div>Now my questions ...</div>
<div><br>
</div>
<div>Does OVMS have a fallback on SIM5360 Europe to 2g (EDGE) if
3g is not available?</div>
<div><br>
</div>
<div>I also did some reading in the modem documentation and tried
to send some AT commands. Goal is to try to force the SIM into
2g mode. I tried i.e.</div>
<div><br>
</div>
<div>simcom muxtx 2 AT+COPS?</div>
<div><br>
</div>
<div>to get some information from the SIM, but I don't get an
answer on that command at all. No matter what channel I try. Am
I missing something there?</div>
<div><br>
</div>
<div>Thanx for input.</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Chris</div>
<br>
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