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fix(modem): Fix to allow MSC frame (SIM800 CMUX) after v1.0.2

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Fixes the regression from 8edbac69 that added more strict conditions
for CMUX protocol, but didn't allow MSC frames that might be sent during
initializaiton by SIM800.

Closes https://github.com/espressif/esp-protocols/issues/366
This commit is contained in:
David Cermak
2023-09-26 15:14:53 +02:00
parent 4f2ebaa753
commit 8d5947e5f1
1 changed files with 1 additions and 1 deletions
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2
components/esp_modem/src/esp_modem_cmux.cpp
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@ -144,7 +144,7 @@ bool CMux::data_available(uint8_t *data, size_t len)
return false;
}
} else if ((type & FT_UIH) == FT_UIH && dlci == 0) { // notify the internal DISC command
if (len > 0 && (data[0] & 0xE1) == 0xE1) {
if ((len > 0 && (data[0] & 0xE1) == 0xE1) || (data == nullptr)) {
// Not a DISC, ignore (MSC frame)
return true;
}