Syntax: A(LTER) E(CHO) [ 0 | 1 ]

With this command you can tell the BBS to send back every command you send.
That does not bother the PR net great, because the echo is directly appended
onto the answer. But this way you can assign a command with its result more
easily. The echo production is only active if packet radio interface of BCM is
used (not over console/file/modem).