connectcore-demo-example: adjust BLE payload size

Remove the sleep time between write operations in the BLE service. The communication
problems observed are more related with the size of the payload written rather than
the timing between frames.

Signed-off-by: David Escalona <david.escalona@digi.com>

connectcore-demo-example/demoserver.py

@@ -95,7 +95,7 @@ BT_TAG_VALUE = "value"
 BT_OP_READ = "R"
 BT_OP_WRITE = "W"
 
-BT_PAYLOAD_LIMIT = 200
+BT_PAYLOAD_LIMIT = 140
 
 BT_REQUEST_TIMEOUT = 5000
 
@@ -1010,7 +1010,6 @@ class BluetoothService:
                                               BT_PAYLOAD_LIMIT + BT_PAYLOAD_LIMIT]
                 }
                 self._ble_service.send_data(json.dumps(chunk_data).encode('utf-8'))
-                time.sleep(0.2)
                 chunk_index += 1
         except ConnectCoreBLEException as exc:
             log.error("Unable send data to connected device: %s", str(exc))