aioble: Add support for write-with-update.

This allows a server to write a characteristic and automatically
notify/indicate all subscribed clients.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

micropython/bluetooth/aioble/README.md

@@ -3,7 +3,7 @@ aioble
 
 This library provides an object-oriented, asyncio-based wrapper for MicroPython's [ubluetooth](https://docs.micropython.org/en/latest/library/ubluetooth.html) API.
 
-**Note**: aioble requires MicroPython v1.15 or higher.
+**Note**: aioble requires MicroPython v1.17 or higher.
 
 Features
 --------

micropython/bluetooth/aioble/aioble/server.py

@@ -88,12 +88,12 @@ class BaseCharacteristic:
         else:
             return ble.gatts_read(self._value_handle)
 
-    # Write value to local db.
-    def write(self, data):
+    # Write value to local db, and optionally notify/indicate subscribers.
+    def write(self, data, send_update=False):
         if self._value_handle is None:
             self._initial = data
         else:
-            ble.gatts_write(self._value_handle, data)
+            ble.gatts_write(self._value_handle, data, send_update)
 
     # Wait for a write on this characteristic. Returns the connection that did
     # the write, or a tuple of (connection, value) if capture is enabled for