Initial Configuration of a QuecPython sensor?

[Humancell]

Hello,

In planning my first sensor written in QuecPython and running on a BG95-M3 I need to create a way to do the initial configuration of the sensor. Here is how I do this with ESP32-based WiFi sensors:

1. When the sensor boots, there is an RGB LED that blinks 10 times.
2. During this time if the user pushes an attached button the ESP32 becomes a WiFi AP
3. The user connects to the sensor with a phone or laptop and a configuration portal is displayed in their browser
4. The user enters the configuration values, the sensor writes those to a local file and then reboots.

With a BG95-M3, I'm trying to determine how I would configure the device when there is no WiFi or Bluetooth to use for connectivity. I don't want to add an ESP32 just for configuration.

How are other customers performing this initial configuration? For example, I can't even connect to cellular without the user providing the APN and several other parameters.

Thoughts?

[Danijel002]

Hello,

On BG95-M3 with QuecPython, the configuration (APN, server, credentials, etc.) is stored as a Python or JSON file on the module's filesystem, and the application reads it at boot. To update it, you write to the file using standard Python file functions and reboot.

Two examples from our reference projects:

• DTU Tool cloud_config.py:
  https://github.com/QuecPython/DTU-tool/blob/master/cloud_config.py

• Solution Tracker settings_loc.py:
  https://github.com/QuecPython/solution-tracker/blob/master/code/settings_loc.py

Let me know if you need more details.

[Humancell]

Hello,

Looking at these examples I didn't see where the SIM details and APN configuration is ... can you provide line numbers?

What this seems to mean is that the code must already contain - from the factory - some way to detect the SIM that is put in the device, and then look up the configuration details for that SIM from file system file. This means the device would have to know - as shipped from the factory - some function that can read the installed SIM and then configure the modem based on ICCID/IMSI/SPN, etc.

Is this correct?

If the device can get the initial connection, then the rest of the device could be fetched from a server based on IMEI, and then written locally on the device file system.

Does this sound correct?

[AaronChen002]

Yes, you're absolutely correct.

The device typically comes preloaded with a SIM detection mechanism (e.g., based on ICCID, IMSI, or SPN) that allows it to identify the installed SIM card at boot time. Once detected, the system can look up the corresponding APN and other configuration parameters from a local file (such as a JSON or XML config file stored in the filesystem).