ATOM-DTU-NB-IoT - modem does not respond anymore

felmue

yes. See here.

Thanks
Felix

fkarner

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

felmue

Hello @fkarner

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

Maybe my serial pass-through example can shed some light onto this issue?

Thanks
Felix

fkarner

@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

felmue

Hello @fkarner

thank you for the update. So it's confirmed something's wrong with the first SIM7020G. I still suspect the baudrate got changed somehow, especially since you are writing that the LEDs behave normally.

Thanks
Felix

fkarner

Hi @felmue

Yes I agree, there must be something wrong with this module. I will investigate that later... First priority is to set up one DTU NB IOT module.

Unfortunately also with the working modem I get errors using the MQTT code example:

12:37:55.848 -> Initializing modem...
12:37:55.848 -> [ 62][E][esp32-hal-gpio.c:102] __pinMode(): Invalid pin selected
12:37:55.848 -> E (61) gpio: gpio_set_level(227): GPIO output gpio_num error
12:37:56.138 -> E (364) gpio: gpio_set_level(227): GPIO output gpio_num error

May they come from the reistallation of Arduino IDE?
Here are my compiling settings:

I found the error code here. For sure there must be something wrong with the serial communication.... Strange....

flori

felmue

Hello @fkarner

I get the same error, but it's not fatal. The error stems from the fact that in ATOM_DTU_NB.h a GPIO is defined, e.g.

#define ATOM_DTU_SIM7020_RESET -1

for the SIM7020 reset which isn't connected in the DTU.
If you change that to something like 13 the error goes away.

The program is probably stuck in Inititalzing modem as it tries to check for the SIM card and that it doesn't have a PIN defined.

Have you double-checked that the SIM card is placed in the correct orientation and that it doesn't use a PIN?

Thanks
Felix

fkarner

Hi again @felmue,

Nice to know that there is no problem caused by this error.

Contacts facing upward, shape as indicated on the label, should be OK?
The SIM card does not use a PIN, nevertheless I tried this:

void nbConnect(void) {
  unsigned long start = millis();
  log("SimStatus: " + String(modem.getSimStatus()));
 if (GSM_PIN && modem.getSimStatus() != 3) 
    {
    modem.simUnlock("0000");
    }
  log("SimStatus: " + String(modem.getSimStatus()));
....

gives this:
19:20:52.856 -> SimStatus: 0
19:21:13.040 -> SimStatus: 0
19:21:13.040 -> Initializing modem...

So according to this, the SIM card is not ready, right? Could there be a mechanical problem with the SIM card itself?

flori

felmue

Hello @fkarner

I get SimStatus: 1 when SIM card is installed and recognized. (I get SimStatus: 0 if I remove the SIM card.)

So yes, it appears that something is either wrong with the SIM card you are using or with the sim card slot in the DTU.

Thanks
Felix

fkarner

Hello @felmue,

I used your pass-through code example to send the AT+CSMINS? command wich gives this with inserted SIM card:

20:21:03.854 -> AT+CSMINS?
20:21:03.854 -> +CSMINS: 0,0
20:21:03.854 ->
20:21:03.854 -> OK

So it seems that the SIM card is not recognized... Maybe broken. Do you have any recommendation for Nb Iot SIM cards? Maybe https://www.miotiq.com/ for Italy?

Thanks flori