Extended readme with example code.

Author: tobiasschuerg

README.md

@@ -1 +1,57 @@
 # ESP8266_Influx_DB
+
+Library for NodeMcu / ESP8266 (and Arduino?) for sending measurements to an Influx database.
+
+## Initialization
+```
+ #define INFLUXDB_HOST "192.168.0.32"
+ #define INFLUXDB_PORT "1337"
+ #define INFLUXDB_DATABASE "test"
+
+ // TODO: connect to WiFi
+
+ Influxdb influx(INFLUXDB_HOST); // port defaults to 8086
+ // or
+ Influxdb influx(INFLUXDB_HOST, INFLUXDB_PORT);
+
+ // set the target database
+ influx.setDb(INFLUXDB_DATABASE);
+```
+
+## Sending a single measurement
+**Using an InfluxData object:**
+```
+// create a measurement object
+InfluxData measurement ("temperature");
+measurement.addTag("device", d2);
+measurement.addTag("sensor", "dht11");
+measurement.addValue("value", 24.0);
+
+// write it into db
+influx.write(measurement);
+```
+
+**Using raw-data**
+```
+ influx.write("temperature,device=d2,sensor=dht11 value=24.0")
+```
+
+## Write multiple data points at once
+Batching measurements and send them with a single request will result in a much higher performance.
+```
+
+InfluxData measurement1 = readTemperature()
+influx.prepare(measurement1)
+
+InfluxData measurement2 = readLight()
+influx.prepare(measurement2)
+
+InfluxData measurement3 = readVoltage()
+influx.prepare(measurement3)
+
+// writes all prepared measurements with a single request into db.
+boolean success = influx.write();
+```
+
+## Documentation
+For the documentation see [html/class_influxdb.html](html/class_influxdb.html) (only works locally).