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此连接非彼连接。UDP的connectionless指的是不需要想TCP一样，跟通信伙伴之间建立连接。“The device must be connected to a network with a DHCP server to run this example successfully (DHCP is configured by default).”这里的连接是让你先连到网络上，这一步是需要的，最简步骤如下：
sl_Start Start the SimpleLink device in Wi-Fi Station mode
sl_WlanConnectConnect to a Wi-Fi network
sl_Socket Create a socket
sl_SendTo Sends UDP data
sl_Close Close the socket
sl_Stop Stops the SimpleLink device
