demonstrate reading/writing a characteristic

client/ble.py

@@ -0,0 +1,28 @@
+import code
+import readline
+import rlcompleter
+import asyncio
+from bleak import BleakClient,BleakScanner
+
+readline.parse_and_bind("tab: complete")
+
+address = "FF:E4:05:1A:8F:FF"
+CURRENT_INDEX_UUID = "76be25c2-0803-44fc-a97c-bcb56c69c926"
+
+
+async def main(address):
+    print("go")
+    devices = await BleakScanner.discover()
+    for d in devices:
+        print(d)
+
+    async with BleakClient(address, timeout=30) as client:
+        current_index = await client.read_gatt_char(CURRENT_INDEX_UUID)
+        print(f"Model Number: {current_index}")
+        current_index = ord(current_index) + 1
+        await client.write_gatt_char(CURRENT_INDEX_UUID, bytes([current_index]))
+        current_index = await client.read_gatt_char(CURRENT_INDEX_UUID)
+        print(f"Model Number: {current_index}")
+
+
+asyncio.run(main(address))

ecu-esp32/src/wibble.rs

@@ -30,7 +30,7 @@ struct WifiProvisioningService {
     #[characteristic(uuid = "76be25c2-0802-44fc-a97c-bcb56c69c926", read, notify, value = 0)]
     max_network_index: u8,
 
-    #[characteristic(uuid = "76be25c2-0803-44fc-a97c-bcb56c69c926", write, value = 0)]
+    #[characteristic(uuid = "76be25c2-0803-44fc-a97c-bcb56c69c926", read, write, value = 0)]
     current_network_index: u8,
 
     // for arrays > 32 we must supply a default value : see

shell.nix

@@ -7,6 +7,7 @@
     python = (pkgs.python3.withPackages (python-pkgs: [
       python-pkgs.pynacl
       python-pkgs.zeroconf
+      python-pkgs.bleak
     ]));
   in
   pkgs.mkShell rec {