Add Pico communication service

pico-dashboard/comms/communication_service.py

@@ -0,0 +1,48 @@
+from .protocol import (
+    make_status_request,
+    make_set_relay,
+    is_status_response,
+    is_relay_response,
+    is_error,
+)
+
+
+class CommunicationService:
+    def __init__(self, uart_client, app_state):
+        self.uart_client = uart_client
+        self.app_state = app_state
+        self.last_messages = []
+
+    def request_status(self):
+        self.uart_client.send_message(make_status_request())
+
+    def set_relay(self, relay, enabled):
+        self.uart_client.send_message(make_set_relay(relay, enabled))
+
+    def poll(self):
+        messages = self.uart_client.read_available_messages()
+        self.last_messages = messages
+
+        for message in messages:
+            self.handle_message(message)
+
+        return messages
+
+    def handle_message(self, message):
+        if is_status_response(message):
+            self.app_state.update_from_status(message)
+            return
+
+        if is_relay_response(message):
+            self.app_state.update_from_relay_response(message)
+            return
+
+        if is_error(message):
+            self.app_state.set_error(message)
+            return
+
+        self.app_state.set_error({
+            "type": "error",
+            "message": "unknown_message_type",
+            "raw": message,
+        })