I have connected a serial device to my Linux laptop and able to boot into the device as dev/devttyACM0. Everything is fine but I needed to open another terminal as part of a software implementation while something is running in the current terminal. If I open a new terminal and tried to login into the device, it says the device is locked. Is there a way to access the serial device with two terminals parallelly?
The solutions I found for device locked problem is suggesting to kill all the process which would kill the current terminal. Is there a way to access the device by two terminals?
Yes, there actually is. There is a protocol called 07.10 after its official specification number (although the up to date version number is 27.010) specifically created to support that use case.
I wrote an answer about it in this question. It will most likely require a dedicated device driver, but if your modem supports the
AT+CMUXcommand, then 07.10 is a viable option.