Hi, Alex
Thanks for your reply, it appears you’re absolutely correct.
I kicked myself for not studying release notes for L30/R32 versions of firmware. R32 lists, among validated corrections, the following:
ID: 64758
Description: The AirPrime could not reopen a closed TCP socket by AT+WIPDATA.
So it is definitely a firmware bug that persisted until R32 and obviously affects L30.
Which speaks some about embedded software development in Sierra Wireless, but little could be done about that.