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fix(modem): Fix CMUX enter to ignore URC before transition

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Closes https://github.com/espressif/esp-protocols/issues/669
This commit is contained in:
David Cermak
2024-11-29 17:32:29 +01:00
parent c5b49de2db
commit 1284f66d58
1 changed files with 11 additions and 2 deletions
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13
components/esp_modem/src/esp_modem_cmux.cpp
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@ -123,7 +123,12 @@ bool CMux::data_available(uint8_t *data, size_t len)
{
if (data && (type & FT_UIH) == FT_UIH && len > 0 && dlci > 0) { // valid payload on a virtual term
int virtual_term = dlci - 1;
if (virtual_term < MAX_TERMINALS_NUM && read_cb[virtual_term]) {
if (virtual_term < MAX_TERMINALS_NUM) {
if (read_cb[virtual_term] == nullptr) {
// ignore all virtual terminal's data before we completely establish CMUX
ESP_LOG_BUFFER_HEXDUMP("CMUX Rx before init", data, len, ESP_LOG_DEBUG);
return true;
}
// Post partial data (or defragment to post on CMUX footer)
#ifdef DEFRAGMENT_CMUX_PAYLOAD
if (payload_start == nullptr) {
@ -142,7 +147,11 @@ bool CMux::data_available(uint8_t *data, size_t len)
sabm_ack = dlci;
} else if (data == nullptr && dlci > 0) {
int virtual_term = dlci - 1;
if (virtual_term < MAX_TERMINALS_NUM && read_cb[virtual_term]) {
if (virtual_term < MAX_TERMINALS_NUM) {
if (read_cb[virtual_term] == nullptr) {
// silently ignore this CMUX frame (not finished entering CMUX, yet)
return true;
}
#ifdef DEFRAGMENT_CMUX_PAYLOAD
read_cb[virtual_term](payload_start, total_payload_size);
#endif