@felmue
thank you so much. was able to verify that the sim7020G is responding

AT
< AT
9900
< OK
found

so next to find a sim card which works...

Hi Felix
Thanks for the fast response!
I'm pretty sure it is the SIM, while pin is removed the card is probably not valid for NB-IOT. I can also not figure out how to get an NB-IOT compatible SIM card here in Switzerland, seems to be an "enterprise thing" :-(

Before i return the Device and try with the Lora version, is there an easy way for me to test if communication with the sim7020G is ok, so setting up the correct serial and issue an AT command in mycropython by hand?

Tried to find the source code for base/DTU_NB.py but without success.

danke
Andi

Hi
I try to run the following code on a Atom-DTU NB-IOT

from m5stack import *
from m5ui import *
from uiflow import *
from base.DTU_NB import DTU_NB
import time

print('init module.....')
dtu_nb = DTU_NB()
print('dtu initialized.....')

"dtu initialized..." is never printed, if i connect via usb/serial and enter ctrl-C i get the following output:

init module.....
Traceback (most recent call last):
File "main.py", line 30, in <module>
File "base/DTU_NB.py", line 31, in init
File "base/DTU_NB.py", line 42, in ischeck_IP
File "libs/simcom/common.py", line 265, in send_at_cmd
File "libs/simcom/common.py", line 274, in wait_at_cmd_ok
KeyboardInterrupt:
MicroPython d725c2ac8-dirty on 2022-10-13; M5Stack with ESP32
Type "help()" for more information.

while i'm not shure if my sim card is working for nb-iot and not just for LTE, was hoping to be able to communicate with the sim7020G to get some information.
what could be wrong?

Hi
Just got an m5stack fire and was able to connct him to wifi.
Now a barcode is shown and if a ifollow that link i end on the m5go.com webpage.
But on that webpage my fire is lways shown as offline:

ID ( xxxx ) : Offline

I do not have a firewall or something special.

The Serial output looks ok:

ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:4848
ho 0 tail 12 room 4
load:0x40078000,len:7436
load:0x40080000,len:7076
entry 0x40080348

Internal FS (SPIFFS): Mounted on partition 'internalfs' [size: 2490368; Flash address: 0x1A0000]
----------------
Filesystem size: 2281728 B
           Used: 932864 B
           Free: 1348864 B
----------------

Device ID:840d8e258d00
LCD initializing...Done!
[6962] State change: STA_STARTUP ===> STA_GUIDE
[14533] State change: STA_GUIDE ===> STA_CONNECT_WIFI
....[WiFi] event: 4 (Station connected to AP)
        info: {'ssid': 'uhu-privat', 'channel': 1}
.....Connected!
[16615] State change: STA_CONNECT_WIFI ===> STA_WEB_QRCODE
[WiFi] event: 7 (Station got IP from connected AP)
        info: {'ip': '10.1.1.117', 'changed': True}
MicroPython ESP32_LoBo_v3.2.20 - 2018-06-28 on M5Stack with ESP32
Type "help()" for more information.
>>> [M5-xxxxyyyyyyyyyyy] M5Cloud connected.

any idea whats wrong or where i can get support?

thanks
andi