Multitech modem

[Michael A. Lewis]

I am having an issue with a multitech gsm/gprs modem with internet
interface. In my debugging I have gotten down to telnet 192.168.1.5 5000
and am able to issue AT commands (including manually sending an SMS
message to my phone). However, nothing from a program interface. In an
attempt to isolate the problem, I have written small php and perl
programs. The perl program is:

 

Use IO::Socket;

$socket=IO::Socket::INET->new {

       PeerAddr="192.168.1.5",

       PeerPort="5000";

       Proto="tcp",

       Type="SOCK_STREAM"} or die "Could not open port.\n";

Print $socket "at+cmgf=1\m"l

My $inl=<$socket>;

Print "$inl\n";

 

The program never returns from the read from the socket. The PHP version
of the program returns 12 characters (all of which appear to have the
high bit set).

 

As I said, I can telnet into it. I can get to the admin interface using
a browser. Is this some sort of character set issue perhaps? Has anyone
else had this problem? I have tried googling for an answer all day
without result. I would appreciate any help or insight.

 

Thanks,

 

Michael