ADBREQ_NOSEND
adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
if (flags & ADBREQ_NOSEND)
adb_request(&req, NULL, ADBREQ_NOSEND, 1, poll_command);
adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);