add arbitration state timeout

src/ebusd/bushandler.cpp

@@ -652,7 +652,8 @@ result_t BusHandler::handleSymbol() {
   }
   switch (arbitrationState) {
     case as_lost:
-      logDebug(lf_bus, "arbitration lost");
+    case as_timeout:
+      logDebug(lf_bus, arbitrationState == as_lost ? "arbitration lost" : "arbitration lost (timed out)");
       if (m_currentRequest == nullptr) {
         BusRequest *startRequest = m_nextRequests.peek();
         if (startRequest != nullptr && m_nextRequests.remove(startRequest)) {

src/lib/ebus/device.cpp

@@ -596,10 +596,10 @@ bool Device::read(symbol_t* value, bool isAvailable, ArbitrationState* arbitrati
       case ENH_RES_RECEIVED:
         *value = data;
         if (data == SYN && *arbitrationState == as_running && m_arbitrationCheck) {
-          if (m_arbitrationCheck < 2) {  // wait for two SYN symbols before switching to timeout
+          if (m_arbitrationCheck < 3) {  // wait for three SYN symbols before switching to timeout
             m_arbitrationCheck++;
           } else {
-            *arbitrationState = as_lost;
+            *arbitrationState = as_timeout;
             m_arbitrationMaster = SYN;
             m_arbitrationCheck = 0;
           }

src/lib/ebus/device.h

@@ -61,6 +61,7 @@ enum ArbitrationState {
   as_error,    //!< error while sending master address
   as_running,  //!< arbitration currently running (master address sent, waiting for reception)
   as_lost,     //!< arbitration lost
+  as_timeout,  //!< arbitration timed out
   as_won,      //!< arbitration won
 };