@felmue said in ATOM-DTU-NB-IoT - modem does not respond anymore:

hmm, since you already tried changing the modem baudrate I am at a loss what might have gone wrong.

Hi Felix,

thank you very much for your answer and the code example. I can upload the code, without errors. The Atom stops here:

19:19:49.162 -> ets Jun 8 2016 00:22:57
19:19:49.162 ->
19:19:49.162 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
19:19:49.162 -> configsip: 188777542, SPIWP:0xee
19:19:49.162 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
19:19:49.162 -> mode:DIO, clock div:1
19:19:49.162 -> load:0x3fff0030,len:1344
19:19:49.162 -> load:0x40078000,len:13964
19:19:49.162 -> load:0x40080400,len:3600
19:19:49.162 -> entry 0x400805f0
19:19:51.594 -> Start SIM7020 passthrough test

Unfortunately I do not get answer thru the serial monitor... I've tried:
AT+CEER=?, AT+CGMI=?, AT+CFUN=1. No response... By the way the modem LED's show acitivity red is on, blue flashes with ~.5Hz....

After that I reinstalled Arduino IDE. Now there are only the M5Stack Boards and the Arduino Boards listed. As Libraries I installed only the M5Unified and the M5GFX. I'm clueless. What could I try next?

Update: I've tried another 7020G modem. That one answers....

*19:43:58.890 -> ets Jun 8 2016 00:22:57
19:43:58.890 ->
19:43:58.890 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
19:43:58.922 -> configsip: 188777542, SPIWP:0xee
19:43:58.922 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
19:43:58.922 -> mode:DIO, clock div:1
19:43:58.922 -> load:0x3fff0030,len:1344
19:43:58.922 -> load:0x40078000,len:13964
19:43:58.922 -> load:0x40080400,len:3600
19:43:58.922 -> entry 0x400805f0
19:44:01.378 -> Start SIM7020 passthrough test
19:44:04.165 -> AT+CEER=?

19:44:04.197 -> +CEER: (0,1)
19:44:04.197 ->
19:44:04.197 -> OK
19:44:14.518 -> AT+CGMI=?*

Thanks, flori

Hello,

I'm working as well with the above mentioned hardware (7020G modem). For a while the program worked fine. Unfortunately since some time the modem does not respond anymore.

The example MQTT code given here does not work (no errors). I think I'm using the needed libraries, so I would not expect errors coming from there. The here already mentioned way to solve the problem by changing the baudrate was not successfull - still silence.

The Serial Monitor Output indicates that the initialisation is not possible:
21:23:10.998 -> waiting....1067s
21:23:26.485 -> waiting....1082s
21:23:41.922 -> waiting....1098s
21:23:57.420 -> waiting....1113s
21:24:12.866 -> waiting....1129s
21:24:28.348 -> waiting....1144s
21:24:43.793 -> waiting....1159s
21:24:59.276 -> waiting....1175s

so the M5Atom is still stuck here:

 while (!modem.init()) {
        log("waiting...." + String((millis() - start) / 1000) + "s");
    };

I really don't know how to solve this problem. Since I'm not an expert in programming I would be thankful if someone could help me out with a code to send simple AT-Commands via the Serial Input.

Thanks in advance
flori