Using yaml for configuration

config.yaml

@@ -0,0 +1,6 @@
+# Server address of the mqtt broker
+mqtt_server: mqtt://192.168.178.48
+
+sensors:
+  zigbee2mqtt/0x00158d00073a7ba8:
+    name: Test Sensor

data.csv

@@ -1 +0,0 @@
-2021-10-19 22:22:08 +0200,Test Sensor,62.97,26.99,972,100,3195,46

logger.rb

@@ -4,35 +4,32 @@ require 'rubygems'
 require 'mqtt'
 require 'json'
 require 'CSV'
+require 'yaml'
+
+config  = YAML.load_file('config.yaml')
 
 # MQTT Server configuration
 SERVER = '192.168.178.48'
 
 # Sensor configuration
-sensors = {
-  'zigbee2mqtt/0x00158d00073a7ba8': {
-    'name': 'Test Sensor',
-    'min_humidity': 61,
-    'max_humidity': 64
-  }
-}
+sensors_config = config['sensors']
 
 # Connect to the MQTT broker
-MQTT::Client.connect(SERVER) do |client|
+MQTT::Client.connect(config['mqtt_server']) do |client|
   # For each sensor
-  sensors.each_key do |sensor_topic|
-    sensor = sensors[sensor_topic]
+  sensors_config.each_key do |sensor_topic|
+    sensor = sensors_config[sensor_topic]
     # Subscribe its topic
     client.get(sensor_topic.to_s) do |topic, message|
       # Log the output
-      puts "#{sensor[:name]}: #{message}"
+      puts "#{sensor["name"]}: #{message}"
 
       payload = JSON.parse(message)
 
       # Log payload in a csv file
-      CSV.open('data.csv', 'wb') do |csv|
+      CSV.open('data.csv', 'wb+') do |csv|
         csv << [Time.now,
-                sensor[:name],
+                sensor["name"],
                 topic,
                 payload['humidity'],
                 payload['temperature'],