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fix(esp_modem): CMUX to ignore MSC frames

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Otherwise it gets confused with DISC frame and causes trouble when entering
CMUX mode (if device sends MSC requests)

Closes https://github.com/espressif/esp-protocols/issues/140
This commit is contained in:
David Cermak
2022-09-16 16:17:01 +02:00
parent 9d9d0db1ee
commit ce175df376
1 changed files with 7 additions and 0 deletions
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7
components/esp_modem/src/esp_modem_cmux.cpp
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@ -143,6 +143,10 @@ void CMux::data_available(uint8_t *data, size_t len)
#endif
}
} else if ((type&FT_UIH) == FT_UIH && dlci == 0) { // notify the internal DISC command
if (len > 0 && (data[0] & 0xE1) == 0xE1) {
// Not a DISC, ignore (MSC frame)
return;
}
Scoped<Lock> l(lock);
sabm_ack = dlci;
}
@ -385,6 +389,9 @@ bool CMux::init()
return false;
}
}
if (i > 1) { // wait for each virtual terminal to settle MSC (no need for control term, DLCI=0)
usleep(100'000);
}
}
return true;
}