Add Shelly 1 example node

examples/shelly1/README.rst

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+=========================
+Example Code for Shelly 1
+==========================
+
+This example code can switch the relay on and off via MQTT.
+
+https://shelly.cloud/shelly1-open-source/

examples/shelly1/main.py

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+import settings
+
+from machine import Pin
+from aswitch import Switch
+
+from homie.node import HomieNode
+from homie.device import HomieDevice
+from homie.property import HomieNodeProperty
+from homie.constants import TRUE, FALSE
+
+
+def reset(led):
+    import machine
+    wdt = machine.WDT()
+    wdt.feed()
+    led(0)
+    machine.reset()
+
+
+class SmartSocket(HomieNode):
+    def __init__(self):
+        super().__init__(id="relay", name="Power Socket", type="Relay")
+        self.relay = Pin(4, Pin.OUT, value=0)
+        self.switch = Pin(5, Pin.IN)
+
+        self.relay_property = HomieNodeProperty(
+            id="power",
+            name="Relay",
+            settable=True,
+            retained=True,
+            datatype="boolean",
+            default=FALSE,
+            restore=True,
+        )
+        self.add_property(self.relay_property)
+
+        self.button = Switch(self.switch)
+        self.button.open_func(self.toggle, ())
+        self.button.close_func(self.toggle, ())
+
+    def off(self):
+        self.relay(0)
+        self.relay_property.data = FALSE
+
+    def on(self):
+        self.relay(1)
+        self.relay_property.data = TRUE
+
+    def callback(self, topic, payload, retained):
+        if b"power" in topic:
+            if payload == FALSE:
+                self.off()
+            elif payload == TRUE:
+                self.on()
+
+    def toggle(self):
+        if self.relay_property.data == TRUE:
+            self.off()
+        else:
+            self.on()
+
+
+def main():
+    homie = HomieDevice(settings)
+    homie.add_node(SmartSocket())
+    homie.start()
+
+
+if __name__ == "__main__":
+    main()