PPPOS doesn't work with Esp32 TTGO T-Call

[GiacomoGenovese]

Hi all, I would use the TTGO T-call [https://github.com/Xinyuan-LilyGO/TTGO-T-Call] to create my GPS-GSM tracker. The board as a SIM800L chip integrated and I tried to use some code like the one prived by Alvaro @ https://github.com/alvarowolfx/asset-tracker-gcp-mongoose-os . Anyway, I'm not able to connect to the mobile network and I keep getting this error:

"Serial console

20190730-142408/2.14.0-19-gb14a864-master

Ports available: COM3 COM4

[Sep 19 19:45:22.018] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:22.024] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:22.034] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:24.448] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:27.527] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:27.532] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:27.538] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:28.220] mongoose_poll New heap free LWM: 180240 [Sep 19 19:45:29.930] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:32.997] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:33.004] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:33.007] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:35.226] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:38.318] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:38.323] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:38.328] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:40.799] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:43.828] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:43.835] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:43.839] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:46.227] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:49.328] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:49.334] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:49.337] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:51.696] mgos_net_on_change_c PPP: connecting [Sep 19 19:45:54.748] mgos_pppos_uart_disp Command timed out: ATH [Sep 19 19:45:54.754] mgos_pppos_uart_disp Connecting (UART1, APN 'wap.tim.it')... [Sep 19 19:45:54.758] mgos_net_on_change_c PPP: disconnected [Sep 19 19:45:55.028] mongoose_poll New heap free LWM: 180044 [Sep 19 19:45:57.027] mongoose_poll New heap free LWM: 179828 [Sep 19 19:45:57.031] mgos_net_on_change_c PPP: connecting ........"

I also had a look to a similar issue in forum https://github.com/mongoose-os-libs/pppos/issues/2

Can you give me any help?

Thanks.

Bests.

[rojer]

from the log i see that the chip cannot communicate with the modem. have you configured the UART pins as specificed? how do you configure modem?

[GiacomoGenovese]

Thanks for your reply. We solved it with better pin configuration and a different antenna.