[Travis] Changes needed due to update core 2.6.0 for File::write

Author: TD-er

src/ESPEasy.ino

@@ -498,6 +498,7 @@ void loop()
   if(MainLoopCall_ptr)
       MainLoopCall_ptr();
   */
+  dummyString = String(); // Fixme TD-er  Make sure this global variable doesn't keep memory allocated.
 
   updateLoopStats();
 

src/ESPEasyStorage.ino

@@ -46,7 +46,9 @@ String appendLineToFile(const String& fname, const String& line) {
   SPIFFS_CHECK(f, fname.c_str());
   const size_t lineLength = line.length();
   for (size_t i = 0; i < lineLength; ++i) {
-    SPIFFS_CHECK(f.write(line[i]), fname.c_str());
+    // See https://github.com/esp8266/Arduino/commit/b1da9eda467cc935307d553692fdde2e670db258#r32622483
+    uint8_t value = static_cast<uint8_t>(line[i]);
+    SPIFFS_CHECK(f.write(&value, 1), fname.c_str());
   }
   f.close();
   return "";
@@ -71,7 +73,9 @@ String BuildFixes()
     {
       for (int x = 0; x < 4096; x++)
       {
-        SPIFFS_CHECK(f.write(0), fname.c_str());
+        // See https://github.com/esp8266/Arduino/commit/b1da9eda467cc935307d553692fdde2e670db258#r32622483
+        uint8_t zero_value = 0;
+        SPIFFS_CHECK(f.write(&zero_value, 1), fname.c_str());
       }
       f.close();
     }
@@ -621,7 +625,9 @@ String SaveToFile(char* fname, int index, byte* memAddress, int datasize)
     byte *pointerToByteToSave = memAddress;
     for (int x = 0; x < datasize ; x++)
     {
-      SPIFFS_CHECK(f.write(*pointerToByteToSave), fname);
+      // See https://github.com/esp8266/Arduino/commit/b1da9eda467cc935307d553692fdde2e670db258#r32622483
+      uint8_t byteToSave = *pointerToByteToSave;
+      SPIFFS_CHECK(f.write(&byteToSave, 1), fname);
       pointerToByteToSave++;
       if (x % 256 == 0) {
         // one page written, do some background tasks

src/_P002_ADC.ino

@@ -110,7 +110,7 @@ boolean Plugin_002(byte function, struct EventStruct *event, String& string)
       {
         if (PCONFIG(0))   //Oversampling?
         {
-          uint16_t currentValue = P002_performRead();
+          uint16_t currentValue = P002_performRead(event);
           Plugin_002_OversamplingValue += currentValue;
           ++Plugin_002_OversamplingCount;
           if (currentValue > Plugin_002_OversamplingMaxVal) {
@@ -165,7 +165,7 @@ float P002_getOutputValue(struct EventStruct *event, int16_t &raw_value) {
     float_value = sum / count;
     raw_value = static_cast<int16_t>(float_value);
   } else {
-    raw_value = P002_performRead();
+    raw_value = P002_performRead(event);
     float_value = static_cast<float>(raw_value);
   }
   if (PCONFIG(3))   //Calibration?
@@ -183,7 +183,7 @@ float P002_getOutputValue(struct EventStruct *event, int16_t &raw_value) {
   return float_value;
 }
 
-uint16_t P002_performRead() {
+uint16_t P002_performRead(struct EventStruct *event) {
   uint16_t value = 0;
   #if defined(ESP8266)
     value = analogRead(A0);