add modbus debug log to debug page

Author: zivillian

include/debug.h

@@ -0,0 +1,16 @@
+#ifndef DEBUG_H
+    #define DEBUG_H
+
+    #include <Arduino.h>
+    #include <ESPAsyncWebServer.h>
+    class WebPrint:public Print{
+        private:
+            Print *_serial;
+            AsyncResponseStream *_response;
+        public:
+            WebPrint(Print *serial, AsyncResponseStream *reponse);
+            size_t write(uint8_t) override;
+            size_t write(const uint8_t *buffer, size_t size) override;
+    };
+
+#endif

include/pages.h

@@ -7,6 +7,7 @@
     #include <ModbusClientRTU.h>
     #include <Update.h>
     #include "config.h"
+    #include "debug.h"
 
     void setupPages(AsyncWebServer* server, ModbusClientRTU *rtu, ModbusBridgeWiFi *bridge, Config *config, WiFiManager *wm);
     void sendResponseHeader(AsyncResponseStream *response, const char *title);

platformio.ini

@@ -16,5 +16,5 @@ lib_deps =
     https://github.com/tzapu/WiFiManager.git
     https://github.com/me-no-dev/ESPAsyncWebServer.git
     eModbus
-;build_flags = -DLOG_LEVEL=LOG_LEVEL_DEBUG
+build_flags = -DLOG_LEVEL=LOG_LEVEL_DEBUG
 monitor_speed = 115200

src/debug.cpp

@@ -0,0 +1,16 @@
+#include "debug.h"
+
+WebPrint::WebPrint(Print *serial, AsyncResponseStream *response)
+    :_serial(serial)
+    ,_response(response)
+{}
+
+size_t WebPrint::write(uint8_t arg){
+     _response->print("(char)arg");
+    return _serial->write(arg);
+}
+
+size_t WebPrint::write(const uint8_t *buffer, size_t size){
+    _response->print((const char*)buffer);
+    return _serial->write(buffer, size);
+}

src/pages.cpp

@@ -233,9 +233,15 @@ void setupPages(AsyncWebServer *server, ModbusClientRTU *rtu, ModbusBridgeWiFi *
     if (request->hasParam("func", true)){
       func = request->getParam("func", true)->value();
     }
-    ModbusMessage answer = rtu->syncRequest(0xdeadbeef, slaveId.toInt(), func.toInt(), reg.toInt(), 1);
     auto *response = request->beginResponseStream("text/html");
     sendResponseHeader(response, "Debug");
+    response->print("<pre>");
+    auto previous = LOGDEVICE;
+    auto debug = WebPrint(previous, response);
+    LOGDEVICE = &debug;
+    ModbusMessage answer = rtu->syncRequest(0xdeadbeef, slaveId.toInt(), func.toInt(), reg.toInt(), 1);
+    LOGDEVICE = previous;
+    response->print("</pre>");
     if (answer.getError() == SUCCESS){
       auto count = answer[2];
       response->print("<span >Answer: 0x");
@@ -375,6 +381,9 @@ void setupPages(AsyncWebServer *server, ModbusClientRTU *rtu, ModbusBridgeWiFi *
     ".e{"
       "color:red;"
     "}"
+    "pre{"
+      "text-align:left;"
+    "}"
     );
     response->addHeader("ETag", __DATE__ "" __TIME__);
     request->send(response);