Hey Michael

Thanx for the help :-)

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 ...

Here some (German) information on the "site lite" transmitters:

https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152

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 ...

Greetinx

Chris


Am Sonntag, den 02.08.2020, 10:59 +0200 schrieb Michael Balzer:
Chris,

how to send modem commands and read the responses:

OVMS# log level debug simcom
Logging level for simcom set to debug
OVMS# simcom cmd AT+COPS?
SIMCOM command has been sent.
D (164488782) simcom: tx mcmd ch=4 len=10  : AT+COPS?
D (164488792) simcom: rx line ch=4 len=23  : +COPS: 0,0,"congstar",2
D (164488802) simcom: rx line ch=4 len=2   : OK

Now let's see if we have 3G:

OVMS# simcom cmd AT+CPSI?
SIMCOM command has been sent.
D (164693462) simcom: tx mcmd ch=4 len=10  : AT+CPSI?
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
D (164693482) simcom: rx line ch=4 len=2   : OK

Yes. Well, no surprise, Telekom network :-).

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.

Regards,
Michael


Am 02.08.20 um 09:39 schrieb Chris van der Meijden:
Hi all

I'm trying to understand some principals of the SIM connection methods of OVMS.

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.

So these transmitters seem to offer only 2g and 4g, but no more 3g (really ???).

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).

Now my questions ...

Does OVMS have a fallback on SIM5360 Europe to 2g (EDGE) if 3g is not available?

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.

simcom muxtx 2 AT+COPS?

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?

Thanx for input.

Regards

Chris

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