Add support for PowerMeter

Should be Ok for power, but not energy.. still need to figure out how to
get the right values

devices/protocols/ZwaveJS/xaal/zwavejs/devices.py

@@ -55,7 +55,7 @@ def build_devices(node: Node, eng: AsyncEngine):
             obj = PowerRelay(node, value, base_addr)
 
         if value_is_command_class(value, COMMAND_CLASS.METER):
-            # obj = PowerMeter(node, value, base_addr)
+            obj = PowerMeter(node, value, base_addr)
             pass
 
         if obj is not None and obj.dev:
@@ -79,7 +79,7 @@ class ZwaveDevice(object):
         dev.info = f"{self.node.node_id}"
         self.node.on(const.EVT_VALUE_UPDATED, self.update)
 
-    def update(self, event: Event):
+    def update(self, event: dict):
         print(event)
 
 
@@ -93,7 +93,7 @@ class PowerRelay(ZwaveDevice):
         self.dev = dev
         self.state = value
 
-    def update(self, event: Event):
+    def update(self, event: dict):
         if self.dev:
             value = event['value']
             if self.state == value:
@@ -111,5 +111,14 @@ class PowerMeter(ZwaveDevice):
     def __init__(self, node: Node, value: Value, base_addr: bindings.UUID):
         super().__init__(node)
         self.state = value
-        self.dev = devices.powermeter(base_addr)
-        self.dev.unsupported_attributes = ['devices']
+        dev = devices.powermeter(base_addr)
+        dev.unsupported_attributes = ['devices']
+        dev.attributes['power'] = value.value
+        self.dev = dev
+        self.power = value
+
+    def update(self, event: dict):
+        if self.dev:
+            value = event['value']
+            if self.power == value:
+                self.dev.attributes["power"] = value.value