More cellular module supports like Quectel EG25 (AEGHB-156)

[dumtux]

Quectel released more different kinds of modems like EC20, EC25, and EG25. Some of them support LTE and have better availability for mass production use. Currently, I see only BG96 is supported by default. How to make Quectel EG25 module work? (Or is there any further plan to support more modules?)

[tswen]

Actually, multiple types of modems are supported. You just need to modify the configuration items BRIDGE_MODEM_USB_VID, BRIDGE_MODEM_USB_PID, and BRIDGE_MODEM_USB_INTERFACE_NUMBER. If you only use the modem and SoftAP netif interfaces, it is recommended to try https://github.com/espressif/esp-iot-solution/tree/master/examples/usb/host/usb_cdc_4g_module.

[dumtux]

That sounds good. If I knew it, I should use USB to connect the modem. However, I tried using UART just like the TinyGSM Arduino library does, as It was my major lib to work with simple 4G module usage projects. I'll connect ESP32-S3's USB to the modem in my next hardware revision.

Is there any way to make EG25/EC25 modules work with the UART connection? Below is my connection diagram.

[tswen]

Just use this demo, then configure the tx, rx, and baud rate in menuconfig. It is recommended to adjust the baud rate of both the ESP32 and modem to 115200 for the first time.