From 294f1731c97cbd3e0a4b42999b2a21c174e59db1 Mon Sep 17 00:00:00 2001
From: Thomas Hooge <thomas@hoogi.de>
Date: Sun, 1 Mar 2026 11:55:18 +0100
Subject: [PATCH] NMEA2000 status for web status page

---
 include/main.h                |  2 ++
 lib/Nmea2kTwai/Nmea2kTwai.cpp | 11 ++++++++++-
 lib/Nmea2kTwai/Nmea2kTwai.h   |  1 +
 src/main.cpp                  |  6 +++---
 src/webserver.cpp             |  6 ++++++
 5 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/include/main.h b/include/main.h
index f30dc9a..8ac5d4f 100644
--- a/include/main.h
+++ b/include/main.h
@@ -44,6 +44,8 @@
 // WIFI AP
 #define WIFI_CHANNEL 9
 #define WIFI_MAX_STA 2
+#define WIFI_SSID "OBPKP61"
+#define WIFI_PASS "keypad61"
 
 // NMEA2000 defaults
 #define N2K_DEFAULT_NODEID 124
diff --git a/lib/Nmea2kTwai/Nmea2kTwai.cpp b/lib/Nmea2kTwai/Nmea2kTwai.cpp
index b14d7e1..09aa077 100644
--- a/lib/Nmea2kTwai/Nmea2kTwai.cpp
+++ b/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."},
diff --git a/lib/Nmea2kTwai/Nmea2kTwai.h b/lib/Nmea2kTwai/Nmea2kTwai.h
index 1dd5ab3..233a6c0 100644
--- a/lib/Nmea2kTwai/Nmea2kTwai.h
+++ b/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;
 
 };
diff --git a/src/main.cpp b/src/main.cpp
index 9d82c9d..dc501ac 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -37,8 +37,8 @@ static const char* TAG = "MAIN";
 uint64_t chipid = ESP.getEfuseMac();
 uint8_t loglevel = 5;
 
-const char* wifi_ssid = "OBPKP61";
-const char* wifi_pass = "keypad61";
+const char* wifi_ssid = WIFI_SSID;
+const char* wifi_pass = WIFI_PASS;
 bool ap_hidden = false;
 bool ap_enabled = true;
 
@@ -347,7 +347,6 @@ void setup() {
     WiFi.persistent(false);
     WiFi.mode(WIFI_MODE_AP);
 
-
     // IPAddress ap_addr(192, 168, 15, 1);
     IPAddress ap_addr;
     ap_addr.fromString(apip);
@@ -436,6 +435,7 @@ void setup() {
     NMEA2000.ExtendTransmitMessages(TransmitPGNs);
     pN2kDeviceList = new tN2kDeviceList(&NMEA2000);
     // Debug: NMEA2000.EnableForward(true);
+
     NMEA2000.Open();
 
     led_init();
diff --git a/src/webserver.cpp b/src/webserver.cpp
index cb24a1b..29647d4 100644
--- a/src/webserver.cpp
+++ b/src/webserver.cpp
@@ -208,6 +208,12 @@ void webserver_init() {
         doc["n2kDestA"] = config.getString("n2kDestA");
         doc["n2kDestB"] = config.getString("n2kDestB");
         doc["n2kDestC"] = config.getString("n2kDestC");
+
+        Nmea2kTwai::Status n2kState = NMEA2000.getStatus();
+        Nmea2kTwai::STATE driverState = n2kState.state;
+        doc["n2kstate"] = NMEA2000.stateStr(driverState);
+        doc["n2knode"] = NMEA2000.GetN2kSource();
+
         doc["status"] = "OK";
         String out;
         serializeJson(doc, out);