For ePaper display, show ahoy logo on offline screen

Solves #897

src/plugins/Display/Display_ePaper.cpp

@@ -120,6 +120,28 @@ void DisplayEPaper::lastUpdatePaged() {
     } while (_display->nextPage());
 }
 //***************************************************************************
+void DisplayEPaper::offlineFooter() {
+    int16_t tbx, tby;
+    uint16_t tbw, tbh;
+
+    _display->setFont(&FreeSans9pt7b);
+    _display->setTextColor(GxEPD_WHITE);
+
+    _display->setPartialWindow(0, _display->height() - mHeadFootPadding, _display->width(), mHeadFootPadding);
+    _display->fillScreen(GxEPD_BLACK);
+    do {
+        if (NULL != mUtcTs) {
+            snprintf(_fmtText, sizeof(_fmtText), "offline");
+
+            _display->getTextBounds(_fmtText, 0, 0, &tbx, &tby, &tbw, &tbh);
+            uint16_t x = ((_display->width() - tbw) / 2) - tbx;
+
+            _display->setCursor(x, (_display->height() - 3));
+            _display->println(_fmtText);
+        }
+    } while (_display->nextPage());
+}
+//***************************************************************************
 void DisplayEPaper::actualPowerPaged(float _totalPower, float _totalYieldDay, float _totalYieldTotal, uint8_t _isprod) {
     int16_t tbx, tby;
     uint16_t tbw, tbh, x, y;
@@ -139,6 +161,10 @@ void DisplayEPaper::actualPowerPaged(float _totalPower, float _totalYieldDay, fl
         } else {
             snprintf(_fmtText, sizeof(_fmtText), "offline");
         }
+        if (_totalPower == 0){
+            _display->fillRect(0, mHeadFootPadding, 200,200, GxEPD_BLACK);
+            _display->drawBitmap(0, 0, logo, 200, 200, GxEPD_WHITE);
+        } else {
             _display->getTextBounds(_fmtText, 0, 0, &tbx, &tby, &tbw, &tbh);
             x = ((_display->width() - tbw) / 2) - tbx;
             _display->setCursor(x, mHeadFootPadding + tbh + 10);
@@ -171,6 +197,8 @@ void DisplayEPaper::actualPowerPaged(float _totalPower, float _totalYieldDay, fl
             snprintf(_fmtText, sizeof(_fmtText), "%d Inverter online", _isprod);
             _display->println(_fmtText);
 
+
+        }
     } while (_display->nextPage());
 }
 //***************************************************************************
@@ -185,10 +213,12 @@ void DisplayEPaper::loop(float totalPower, float totalYieldDay, float totalYield
     // call the PowerPage to change the PV Power Values
     actualPowerPaged(totalPower, totalYieldDay, totalYieldTotal, isprod);
 
-    // if there was an change and the Inverter is producing set a new Timestam in the footline
+    // if there was an change and the Inverter is producing set a new Timestamp in the footline
     if ((isprod > 0) && (_changed)) {
         _changed = false;
         lastUpdatePaged();
+    } else if(totalPower==0) {
+        offlineFooter();
     }
 
     _display->powerOff();

src/plugins/Display/Display_ePaper.h

@@ -39,6 +39,7 @@ class DisplayEPaper {
       void headlineIP();
       void actualPowerPaged(float _totalPower, float _totalYieldDay, float _totalYieldTotal, uint8_t _isprod);
       void lastUpdatePaged();
+      void offlineFooter();
 
       uint8_t mDisplayRotation;
       bool _changed = false;