Hi! I'd like to implement SMSlib, but I've notised, that at least atwin
machines the comXX port number is changed with time, if device was removed
and plugged back. So, in our program we should interrogate ports to find
the right gateway properties. In my understanding, we should try to write
something like "AT+GMM" to port; if there is a valid modem there some valid
answer will be returned. It can be done by means of rxtx, isn't it? If I'm
wrong I'll be gratefull to any who will give me right direction :)

Another approach is to try to initialize ~ 50 gateways, with increazing com
port number from COM1 to COM50 and trying to get some data from it and
handling errors. For me it is too straightforward approach.

But what if some functionality already exists in SMSlib?

Hello,

You cannot do this with SMSLib, but your approach is correct.
The RxTx / JavaComm libraries also keep all ports as collections. This may
not work well in Linux, as RxTx does not seem to iterate properly all those
differently named ports. The send-at-command-and-wait-for-an-answer method
could also apply - although a less "elegant" approach.

Thank you for your answer!