reject device when mac or ip not exist or in the wrong format

lib/accessory.js

@@ -19,6 +19,18 @@ class OccupancySensor {
 
 		this.thresholdTimer = null
 
+		if (!this.serial) {
+			this.log(`Can't initiate ${this.name} device without mac address or ip address`)
+			this.log(`Please change your config`)
+			return
+		}
+
+		if (typeof this.serial !== 'string') {
+			this.log(`Wrong mac/ip address format`)
+			this.log(`Please adjust your config to include proper ip address (10.0.0.x) or mac address (3e:34:ae:87:f1:cc)`)
+			return
+		}
+
 		this.UUID = this.api.hap.uuid.generate(this.serial)
 		this.accessory = platform.accessories.find(accessory => accessory.UUID === this.UUID)