NMEA2000 status for web status page

lib/Nmea2kTwai/Nmea2kTwai.cpp

@@ -37,12 +37,20 @@ bool Nmea2kTwai::CANSendFrame(unsigned long id, unsigned char len, const unsigne
         if (rt == ESP_ERR_TIMEOUT) {
             if (txTimeouts < TIMEOUT_OFFLINE) {
                 txTimeouts++;
+            } else if (!tx_offline) {
+                tx_offline = true;
+                LOGW(TAG, "twai tx offline timeout reached");
             }
         }
-        LOGW(TAG, "twai transmit for %ld failed: %x", LOGID(id), (int)rt);
+        if (txTimeouts > 0 && !tx_offline) {
+            LOGW(TAG, "twai transmit for %ld failed: %x", LOGID(id), (int)rt);
+        } else {
+            // TODO log every <n> seconds a offline message
+        }
         return false;
     }
     txTimeouts = 0;
+    tx_offline = false;
     LOGV(TAG, "twai transmit id %ld, len %d", LOGID(id), (int)len);
     return true;
 }
@@ -231,6 +239,7 @@ const char * Nmea2kTwai::stateStr(const Nmea2kTwai::STATE &st)
     }
     return "ERROR";
 }
+
 const Nmea2kTwai::ManufacturerEntry Nmea2kTwai::ManufacturerTable[] = {
     {0, "Reserved"},
     {69, "ARKS Enterprises, Inc."},

lib/Nmea2kTwai/Nmea2kTwai.h

@@ -58,6 +58,7 @@ private:
     uint32_t txTimeouts = 0;
     // GwIntervalRunner timers;
     bool disabled = false;
+    bool tx_offline = false;
     unsigned long lastRecoveryStart = 0;
 
 };