12 ble 提供数据传输方式

The AttributeProtocol defines six types of messages:

• 1) requests sent from the client to the server;
• 2) responses sent from the server to the client in reply to a request;
• 3)commands sent from the client to the server that have no response;
• 4)notifications sent from the server to the client that have no confirmation; - 5)indications sent from the server to the client;
• 6) confirmations sent from the client to the server in reply to an indication. //

  So, both client and server can

  initiate communication with messages tha