Add HTTP fallback mode to Pico communication service

pico-dashboard/comms/communication_service.py

@@ -8,16 +8,30 @@ from .protocol import (
 
 
 class CommunicationService:
-    def __init__(self, uart_client, app_state):
+    def __init__(self, uart_client, app_state, http_client=None):
         self.uart_client = uart_client
+        self.http_client = http_client
         self.app_state = app_state
         self.last_messages = []
+        self.use_http_fallback = False
 
     def request_status(self):
+        if self.use_http_fallback and self.http_client:
+            message = self.http_client.get_status()
+            self.handle_message(message)
+            return message
+
         self.uart_client.send_message(make_status_request())
+        return None
 
     def set_relay(self, relay, enabled):
+        if self.use_http_fallback and self.http_client:
+            message = self.http_client.set_relay(relay, enabled)
+            self.handle_message(message)
+            return message
+
         self.uart_client.send_message(make_set_relay(relay, enabled))
+        return None
 
     def poll(self):
         messages = self.uart_client.read_available_messages()
@@ -28,6 +42,12 @@ class CommunicationService:
 
         return messages
 
+    def enable_http_fallback(self):
+        self.use_http_fallback = True
+
+    def disable_http_fallback(self):
+        self.use_http_fallback = False
+
     def handle_message(self, message):
         if is_status_response(message):
             self.app_state.update_from_status(message)