Update readme and examples and support float as input

Author: Bjarne Loft

README.md

@@ -1,8 +1,8 @@
 # EasyMqtt
 Easy handling of Mqtt on esp8266
 
-* Easy wifi configuration
-* Easy mqtt configuration
+* Easy wifi configuration using web interface
+* Easy mqtt configuration using web interface
 * Easy configuration of mqtt endpoints
 * Web based UI to see current values
 
@@ -13,14 +13,10 @@ Easy handling of Mqtt on esp8266
 EasyMqtt mqtt;
 
 void setup() {
-  // Setup wifi
-  mqtt.wifi("ssid", "password");
-  mqtt.mqtt("host", 1883, "user", "pass");
-  
-  mqtt.config().setString("foo", "My Foo");
+  mqtt.config().set("foo", "My Foo");
 
-  mqtt["foo"] << [](){
-    return mqtt.config().getString("foo");
+  mqtt["foo"] << [&](){
+    return String(mqtt.config().get("foo", "default"));
   };
 }
 

examples/temperature/temperature.ino

@@ -9,22 +9,12 @@ void setup() {
   mqtt.wifi("ssid", "pass");
   mqtt.mqtt("server", 1883, "user", "password");
 
-  mqtt["temperature"] << []() {
-    float value = dht.readTemperature();
-    if(isnan(value)) {
-      return String("");
-    } else {
-      return String(value);
-    }
+  mqtt["temperature"] << [&]() {
+    return dht.readTemperature();
   };
 
-  mqtt["humidity"] << []() {
-    float value = dht.readHumidity();
-    if(isnan(value)) {
-      return String("");
-    } else {
-      return String(value);
-    }
+  mqtt["humidity"] << [&]() {
+    return dht.readHumidity();
   };
 
 }

src/Entry.cpp

@@ -219,6 +219,23 @@ void Entry::operator<<(std::function<String()> inFunction) {
   Entry::inFunction = inFunction;
 }
 
+void Entry::operator<<(std::function<char *()> inFunction) {
+  Entry::inFunction = [&]() {
+    return String(inFunction());
+  };
+}
+
+void Entry::operator<<(std::function<float()> inFunction) {
+  Entry::inFunction = [&]() {
+    float value = inFunction();
+    if(isnan(value)) {
+      return String("");
+    } else {
+      return String(value);
+    }
+  };
+}
+
 void Entry::operator>>(std::function<void(String payload)> outFunction) {
   Entry::outFunction = outFunction;
 }

src/Entry.h

@@ -99,6 +99,8 @@ class Entry {
      *  Read data from function and send it to mqtt
      */
     void operator<<(std::function<String()> inFunction);
+    void operator<<(std::function<char *()> inFunction);
+    void operator<<(std::function<float()> inFunction);
 
     /**
      *  Handle data comming from mqtt