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Describe the bug
At the first start of the firmware, everything functions stably. But when I execute the command "kernel reboot cold/warm" in the shell, or "pm suspend modem" and then "pm resume modem" the following problem occurs: the exchange between the MCU and the modem is disrupted by UART. I see that the command "ATE0\n" goes to the uart backend, but physically "TE0\n{" (the last character is random) appears at the output
Another problem is related to the choice of an asynchronous API for UART exchange. When installing CONFIG_UART_INTERRUPT_DRIVEN=n, CONFIG_UART_ASYNC_API=y, CONFIG_MODEM_BACKEND_UART_ASYNC=y there are no requests to the modem physically at the UART output. It seems to me that both problems are somehow connected, but maybe they are different problems.