<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body class=""><div>I did some more reading on the SIM5360 and also digged a bit through the simcom source. Found loads of AT-commands there :-)</div><div><br></div><div>I could not find an AT command to restrict the selection to 2g. Perhaps I did not look deep enough, but if someone knows the command ...</div><div><br></div><div>I'm still thinking why the automatic fallback to 2g does not happen. </div><div><br></div><div>- The transmitter offers only 2g (GSM 900 mHz) and LTE (800 or 1800). No 3g.</div><div>- I have a signal strength of -110 to -100 dBm</div><div>- AT+COPS? gives me an empty response.</div><div><br></div><div>Could it be possible, that somewhere in the code something like</div><div><br></div><div>- I don't have 3g</div><div>- I do have LTE</div><div>- Lets try LTE</div><div>- I see LTE</div><div>- I have no hardware for LTE</div><div>- OK, don't do anything</div><div><br></div><div>happens? So somehow fallback to 2g never happens?</div><div><br></div><div>Just guessing around ...</div><div><br></div><div>Regards</div><div><br></div><div>Chris</div><div> </div><div><br></div><div>Am Montag, den 03.08.2020, 10:10 +0800 schrieb Mark Webb-Johnson:</div><blockquote type="cite">The SIM5360E should auto-switch between 2G and 3G. It supports the following frequency bands:<div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><span style="color: rgb(0, 0, 0); font-family: arial, verdana, helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">GSM/GPRS/EDGE 850/900/1800/1900MHz;</span></div><div class=""><span style="color: rgb(0, 0, 0); font-family: arial, verdana, helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">UMTS/HSPA+ 900/2100MHz</span></div></blockquote><div class=""><br class=""></div><div class="">There are SIMCOM options/commands to restrict the selection, but the default is automatic.</div><div class=""><br class=""><div>Regards, Mark</div><div><br class=""><blockquote type="cite" class=""><div class="">On 2 Aug 2020, at 6:40 PM, Chris van der Meijden <<a href="mailto:chris@arachnon.de" class="">chris@arachnon.de</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
<div class=""><div class="">Hey Michael</div><div class=""><br class=""></div><div class="">Thanx for the help :-)</div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Here some (German) information on the "site lite" transmitters:</div><div class=""><br class=""></div><div class=""><a href="https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152" class="">https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152</a></div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Greetinx</div><div class=""><br class=""></div><div class="">Chris</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Am Sonntag, den 02.08.2020, 10:59 +0200 schrieb Michael Balzer:</div><blockquote type="cite" class="">
Chris,<br class="">
<br class="">
how to send modem commands and read the responses:<br class="">
<br class="">
<tt class="">OVMS# log level debug simcom</tt><tt class=""><br class="">
</tt><tt class="">Logging level for simcom set to debug</tt><tt class=""><br class="">
</tt><tt class="">OVMS# simcom cmd AT+COPS?</tt><tt class=""><br class="">
</tt><tt class="">SIMCOM command has been sent.</tt><tt class=""><br class="">
</tt><tt class="">D (164488782) simcom: tx mcmd ch=4 len=10 : AT+COPS?</tt><tt class=""><br class="">
</tt><tt class="">D (164488792) simcom: rx line ch=4 len=23 : +COPS:
0,0,"congstar",2</tt><tt class=""><br class="">
</tt><tt class="">D (164488802) simcom: rx line ch=4 len=2 : OK</tt><br class="">
<br class="">
Now let's see if we have 3G:<br class="">
<br class="">
<tt class="">OVMS# simcom cmd AT+CPSI?</tt><tt class=""><br class="">
</tt><tt class="">SIMCOM command has been sent.</tt><tt class=""><br class="">
</tt><tt class="">D (164693462) simcom: tx mcmd ch=4 len=10 : AT+CPSI?</tt><tt class=""><br class="">
</tt><tt class="">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 class=""><br class="">
</tt><tt class="">D (164693482) simcom: rx line ch=4 len=2 : OK</tt><br class="">
<br class="">
Yes. Well, no surprise, Telekom network :-).<br class="">
<br class="">
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 class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 02.08.20 um 09:39 schrieb Chris van
der Meijden:<br class="">
</div>
<blockquote type="cite" cite="mid:1596353995.7318.1.camel@arachnon.de" class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<div class="">Hi all</div>
<div class=""><br class="">
</div>
<div class="">I'm trying to understand some principals of the SIM
connection methods of OVMS.</div>
<div class=""><br class="">
</div>
<div class="">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 class=""><br class="">
</div>
<div class="">So these transmitters seem to offer only 2g and 4g, but no
more 3g (really ???).</div>
<div class=""><br class="">
</div>
<div class="">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 class=""><br class="">
</div>
<div class="">Now my questions ...</div>
<div class=""><br class="">
</div>
<div class="">Does OVMS have a fallback on SIM5360 Europe to 2g (EDGE) if
3g is not available?</div>
<div class=""><br class="">
</div>
<div class="">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 class=""><br class="">
</div>
<div class="">simcom muxtx 2 AT+COPS?</div>
<div class=""><br class="">
</div>
<div class="">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 class=""><br class="">
</div>
<div class="">Thanx for input.</div>
<div class=""><br class="">
</div>
<div class="">Regards</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<br class="">
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