Add will

Author: bloft

ToDo.md

@@ -2,31 +2,31 @@
 
 ## Improvements
 
-Change MqttMap to include reference to mqttclient
+### Change MqttMap to include reference to mqttclient
  * Change loop, publish, ... to not need mqttclient
 
-Add easyMqtt/$id/system/connected + will to indicate if device is online
+### Add easyMqtt/$id/system/connected + will to indicate if device is online
 
 ## Future
 
-Add system info
+### Add system info
  * easyMqtt/$id/system/uptime
  * easyMqtt/$id/system/mem
  * easyMqtt/$id/system/reset
  * easyMqtt/$id/system/debug
  * easyMqtt/$id/system/config
 
-Add better debugging
+### Add better debugging
  * Add new EasyDebug class, extends Print (Print.h), and prints to easyMqtt/$id/system/debug if enabled
  * Add getDebugger on EasyMqtt that returns the EasyDebug instance
 
-Add support for filters
+### Add support for filters
  * Don't send if value is the same as last.
  * Don't send if value is Nan
 
-Add support for float type (extend MqttMap)
+### Add support for float type (extend MqttMap)
 
-Add publish configured endpoints, to support openhab2 auto configure
+### Add publish configured endpoints, to support openhab2 auto configure
 something like
 easyMqtt/$id/system/config
 {
@@ -36,3 +36,27 @@ easyMqtt/$id/system/config
 }
 
    Read / Write / String / Number / ...
+
+### Add config values
+Add config values that is persisted to flash memory
+
+http://esp8266.github.io/Arduino/versions/2.0.0/doc/filesystem.html
+
+```C++
+#include <EasyMqtt.h>
+
+EasyMqtt mqtt;
+
+setup() {
+  // init config with name "test" with default value 123
+  // The value can be changed using easyMqtt/$id/config/test
+  // Is loaded from 
+  mqtt.config("timeout", 5000);  
+}
+
+loop() {
+  mqtt.loop();
+  mqtt.config("timeout"); // Read back config value
+}
+
+```

src/EasyMqtt.h

@@ -24,9 +24,10 @@ class EasyMqtt : public MqttMap {
     */
     void mqttReconnect() {
       while (!mqttClient.connected()) {
-        if (mqttClient.connect(deviceId.c_str(), mqtt_username, mqtt_password)) {
+        if (mqttClient.connect(deviceId.c_str(), mqtt_username, mqtt_password), get("system")["connected"].getTopic().c_str(), 2, 0, "false") {
           debug("Connected to MQTT");
           subscribe();
+          get("system")["connected"].publish("true");
         } else {
           Serial.print("failed, rc=");
           Serial.print(mqttClient.state());