Update P1Platform.js

- Add accessory for Capacity tariff, see #69.
- Simulate 1000W current consumption when using `telegram` for testing,
- Add missing error reporting for `telegram` setting.

lib/P1Platform.js

@@ -47,6 +47,8 @@ class P1Platform extends homebridgeLib.Platform {
         if (telegrams[this.config.telegram] != null) {
           const p1 = new P1Client()
           p1
+            .on('error', (error) => { this.warn(error) })
+            .on('warning', (message) => { this.warn(message) })
             .once('telegram', (s) => { this.debug('telegram:\n%s', s) })
             .once('rawData', (obj) => { this.debug('raw data: %j', obj) })
             .once('data', (data) => { this.telegram = data })
@@ -150,7 +152,7 @@ class P1Platform extends homebridgeLib.Platform {
     this.beat = beat
     if (this.telegram != null && beat % 5 === 0) {
       this.telegram.electricity.lastupdated = new Date().toISOString()
-      ++this.telegram.electricity.consumption[this.telegram.electricity.tariff]
+      this.telegram.electricity.consumption[this.telegram.electricity.tariff] += 5 / 3600
       this.onData(this.telegram)
       return
     }
@@ -189,6 +191,11 @@ class P1Platform extends homebridgeLib.Platform {
           this, data.electricityBack, 'Electricity Delivered'
         )
       }
+      if (data.electricity.avg_power != null) {
+        this.electricityCapacity = new P1Accessory.ElectricityCapacity(
+          this, data.electricity
+        )
+      }
       if (data.gas != null) {
         this.gas = new P1Accessory.Gas(this, data.gas)
       }
@@ -203,6 +210,9 @@ class P1Platform extends homebridgeLib.Platform {
       if (this.electricityBack != null) {
         this.electricityBack.check(data.electricityBack)
       }
+      if (this.electricityCapacity != null) {
+        this.electricityCapacity.check(data.electricity)
+      }
       if (this.gas != null) {
         this.gas.check(data.gas)
       }