GPIO 14 modem hardware control needed? (AEGHB-383)

[sirtet]

Is GPIO 14 mandatory in all cases?
In the Photo in the readme, only USB seems to be connected...
I am considering using a 4g USB dongle. That would not be possible then, right?

[leeebo]

@sirtet Sorry, I didn't get your point. Do you mean the Modem Reset Control in usb_cdc_4g_module#hardware-requirement? in this case it's better to let esp32 control modem reset to handle some error case.

[sirtet]

Yes, that was my point. So, this line is not mandatory, but optimal? If so, the readme should maybe be corrected.
Am I correct that the demo photo&video do not use the reset line?
And as a follow up question: I guess the reset could also be done by Interrupting the USB 5v, if no direct access to the modem's reset line is available?

[leeebo]

@sirtet Yes, the demo photo does not use the reset line, but it is recommended in the product.

If the VBUS can be controlled by your ESP32, power-off then power-on has the same effect as reset, In this case reset line is optional