advertising via bluetooth is done

relay/queue.py

@@ -0,0 +1,21 @@
+import uasyncio as asyncio
+
+
+class Queue:
+    def __init__(self):
+        self.items = []
+        self.waiters = []
+
+    async def put(self, item):
+        self.items.append(item)
+        if self.waiters:
+            waiter = self.waiters.pop(0)
+            waiter.set()
+
+    async def get(self):
+        while not self.items:
+            event = asyncio.Event()
+            self.waiters.append(event)
+            await event.wait()
+
+        return self.items.pop(0)