fix service file and init of lib

eq3bt-exporter.py

@@ -24,6 +24,8 @@ startTime = datetime.now()
 eq3bt_metrics = list()
 mutex = threading.Lock()
 
+thermostat = Thermostat(eq3bt_mac)
+
 class RequestHandler(BaseHTTPRequestHandler):
 
     def get_metrics(self):
@@ -75,7 +77,6 @@ def update_metrics():
         eq3bt_metrics.clear()
 
         try:
-            thermostat = Thermostat(eq3bt_mac)
             thermostat.update() 
             eq3bt_metrics.append("target_temperature " + str(int(thermostat.target_temperature)))
             eq3bt_metrics.append("valve " + str(int(thermostat.valve_state)))

eq3bt-exporter.service

@@ -1,5 +1,5 @@
 [Unit]
-Description=Prometheus gas station exporter for fuel prices
+Description=Prometheus eq3bt exporter for thermostats
 Documentation=https://git.mosad.xyz/localhorst/eq3bt-exporter
 Wants=network-online.target
 After=network-online.target