AT+QFWRITE timeout

IoT Modules LPWA Module
1

Hi everyone,
I’m here cause I’m facing some issues with my board (basically a stm32u575 microcontroller plus a quectel bg95m3 modem).
In brief, I get timeout error (421) when I try to write a burst of data into modem’s memory (I initially tried with 1024 and then i dropped down to 64 bytes).
I also tried to enlarge the timeout thresholds but nothing happened.
Unluckily I didn’t find a solution up to now.

The strange thing is the following one though.
In the previous hardware version of this board, the write command never returned error codes, it was almost perfect every time.
In the new hardware release the significant changes regard the UART pins (DTR, CTS and RTS) and the USB ones.

Given that I don’t want to use HW flow control I setup both microcontroller and modem (IFC 0,0) to keep HW flow control disabled.

This is the picture, I don’t how to recover from this.
Does anyone have ideas?

Thanks
Elia

2

Hi @Elia_Mura

Could you please share you test steps with AT commands?

3

Hello,
I finally solved my issue in a quite strange way.
I had to change the response time from ATV0 (0) to ATV1 (OK) in order to let it work.
It is super strange since my code uses ATV0 for everything, even the interrupt routine.

However, doing by trying seemed to work out!
Elia