[2.1 串口通信类serial](2.1%E4%B8%B2%E5%8F%A3%E9%80%9A%E4%BF%A1%E7%B1%BBserial.md) [2.2 协议处理zb_msg](2.2%E5%8D%8F%E8%AE%AE%E5%A4%84%E7%90%86zb_msg.md) [2.3 交叉编译测试](2.3%E4%BA%A4%E5%8F%89%E7%BC%96%E8%AF%91%E6%B5%8B%E8%AF%95.md)