Synaccess Networks NP-0801DTM - Manual (Page 233)

CUSTOM AT COMMANDS
233 HSPA+ AT Commands Reference Guide
Like #SSENDEXT, the device responds with the prompt ‘> ‘ and waits for the data to send, operation is
automatically completed when <bytestosend> are sent.
Test command reports the supported range of values for:
<connId>,<bytestosend>,<remoteIP> and <remotePort>