Refactored MQTT payload handling into separate classes

web/jsonprices.json

@@ -0,0 +1,23 @@
+{
+    "id" : "%s",
+    "prices" : {
+        "0" : %.4f,
+        "1" : %.4f,
+        "2" : %.4f,
+        "3" : %.4f,
+        "4" : %.4f,
+        "5" : %.4f,
+        "6" : %.4f,
+        "7" : %.4f,
+        "8" : %.4f,
+        "9" : %.4f,
+        "10" : %.4f,
+        "11" : %.4f,
+        "12" : %.4f,
+        "min" : %.4f,
+        "max" : %.4f,
+        "cheapest1hr" : "%s",
+        "cheapest3hr" : "%s",
+        "cheapest6hr" : "%s"
+    }
+}