Craig,

From what you sent before, it just seemed that the PPP link could not be established. The CSQ figures you show below indicate the dev board has a better signal (and production is marginal):

ValueRSSI dBmCondition
2-109Marginal
3-107Marginal
4-105Marginal
5-103Marginal
6-101Marginal
7-99Marginal
8-97Marginal
9-95Marginal
10-93OK
11-91OK
12-89OK
13-87OK
14-85OK
15-83Good
16-81Good
17-79Good
18-77Good
19-75Good
20-73Excellent
21-71Excellent
22-69Excellent
23-67Excellent
24-65Excellent
25-63Excellent
26-61Excellent
27-59Excellent
28-57Excellent
29-55Excellent
30-53Excellent

I am not aware of any limitation / restriction on inactive PPP cellular data connections - I guess that would depend on the configuration of individual operators. Can you configure the dev board to send some data?

I am not really sure how to help here, seeing the little extracts of logs you send and not knowing your environment. From a troubleshooting point of view, the logs should show the cellular activity and behaviour of the modem.

Regards, Mark.

On 24 Nov 2021, at 4:38 AM, Craig Leres <leres@xse.com> wrote:

On 11/22/21 18:43, Mark Webb-Johnson wrote:
From the logs, it seems the GSM link is established, but PPP could not be connected.
Could this be a merging coverage area (although the CSQ of 13 seems fine), or some other problem with data connection?
The error messages 'NO CARRIER’ and '+PPPD: DISCONNECTED’ are from the modem itself.

There aren't any ppp error messages until 12 hours after bootup. I ran the dev and a normal module in side-by-side windows and the verbose cellular/simcom messages look similar for the first 12 hours.

I can also see the dev module (sim7600) is active on https://dashboard.hologram.io

Any ideas on how to troubleshoot this?

Is it a problem that the dev box is not configured to upload anything to the V2 server?

Craig

# dev right after bootup
D (287003) cellular: mux-tx #3: AT+CREG?;+CCLK?;+CSQ;+CPSI?;+COPS?
D (287013) cellular: mux-rx-line #3: +CPSI: LTE,Online,310-410,0x8B44,169982472,7,EUTRAN-BAND2,800,5,5,-125,-1205,-881,12
D (287023) cellular: mux-rx-line #3: +CREG: 1,5
D (287023) cellular: mux-rx-line #3: +CCLK: "21/11/22,23:48:12-32"
D (287023) cellular: mux-rx-line #3: +CSQ: 13,99
D (287023) cellular: mux-rx-line #3: +COPS: 0,0,"AT&T Hologram",7


# production right after bootup
D (191983) cellular: mux-tx #3: AT+CREG?;+CCLK?;+CSQ;+CPSI?;+COPS?
D (192003) cellular: mux-rx-line #3: +CPSI: WCDMA,Online,310-410,0xDE74,5704608,WCDMA 850,29,4385,0,6.0,95,36,19,500
D (192013) cellular: mux-rx-line #3: +CREG: 1,5
D (192013) cellular: mux-rx-line #3: +CCLK: "21/11/22,23:54:15-32"
D (192013) cellular: mux-rx-line #3: +CSQ: 9,99
D (192013) cellular: mux-rx-line #3: +COPS: 0,0,"AT&T Hologram",2