How to execute AT commands into the serial port in java?

Question

I have device which connected to the modem using a serial port, which has two SIMs. I have received a requirement to get the IMSI number of these SIMs from the modem. I heard it can be retrieved by giving the AT command "AT+CIMI" to the modem. My question are:

• How is the AT command given to the modem
• if it is possible to retrieve the IMSI number in any other way.
• Are there any libraries to execute the the AT commands

Answer 1

JNI.

At least it was when I did it 10 years ago.

Hopefully there is now an actual library for accessing serial ports :-/