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

espressif · Sep 26, 2023 · 22f1aec · 22f1aec
1 parent 4f2ebaa
commit 22f1aec
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/components/esp_modem/src/esp_modem_cmux.cpp b/components/esp_modem/src/esp_modem_cmux.cpp
@@ -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;
         }