Introduce isInBullshitState() to restart the modem stack quicker when it breaks

components/esp_modem/src/esp_modem_cmux.cpp

@@ -202,6 +202,7 @@ bool CMux::on_recovery(CMuxFrame &frame)
         frame.ptr = recover_ptr;
         state = cmux_state::INIT;
         ESP_LOGI("CMUX", "Protocol recovered");
+        m_isInBullshitState = true;
         if (frame.len > 1 && frame.ptr[1] == SOF_MARKER) {
             // empty frame
             frame.advance();

components/esp_modem/src/esp_modem_dte.cpp

@@ -394,6 +394,13 @@ bool DTE::recover()
     return false;
 }
 
+bool DTE::isInBullshitState()
+{
+    if (!cmux_term)
+        return false;
+    return cmux_term->isInBullshitState();
+}
+
 void DTE::handle_error(terminal_error err)
 {
     if (err == terminal_error::BUFFER_OVERFLOW ||