example.cpp

00001 /**
00002  * @example tcp_server/example.cpp
00003  *
00004  * This is an example of using the TCP server API to
00005  * send/receive data from a remote TCP client.
00006  *
00007  * This example is intended to be used with 'tcp_client.py'
00008  * python script in the same directory as this example.cpp file.
00009  *
00010  * It works as follows:
00011  * 1. Instantiate the WiConnect Library
00012  * 2. Initiate Communication with WiFi Module
00013  * 3. Join the network
00014  * 4. Start the TCP server
00015  * 5. Wait for clients to connect
00016  * 6. Receive data from client
00017  * 7. Send data to client
00018  * 8. Close client connection
00019  * 9. Goto sleep 5
00020  *
00021  */
00022 
00023 
00024 /******************************************************************************
00025  * Example Variables
00026  */
00027 
00028 // The port the server listens on
00029 #define TCP_SERVER_PORT 7
00030 // The maximum simultaneous client connections
00031 // (note this example only supports 1)
00032 #define TCP_SERVER_MAX_CLIENTS 1
00033 
00034 // This is the name of your WiFi network
00035 // Look for this name in your WiFi settings
00036 // (e.g. your phone's list of WiFi networks in the WiFi settings menu)
00037 // tip: add double-quotes around SSID to add spaces to name
00038 #define NETWORK_SSID "\"<YOUR NETWORK NAME HERE>\""
00039 
00040 // This is the password of your WiFi network
00041 // Leave as empty string (e.g "") to connect to OPEN network
00042 #define NETWORK_PASSWORD "\"<YOUR NETWORK PASSWORD HERE>\""
00043 
00044 
00045 /******************************************************************************
00046  * Includes
00047  */
00048 
00049 // include C library headers
00050 #include <stdio.h> // needed for printf
00051 
00052 // include target specific defines
00053 #include "target_config.h"
00054 // include the Wiconnect Host Library API header
00055 #include "Wiconnect.h"
00056 
00057 
00058 
00059 /******************************************************************************
00060  * Local Functions
00061  */
00062 
00063 
00064 /******************************************************************************
00065  * Global Defines
00066  */
00067 
00068 // Transmit/receive buffers for the remote client socket
00069 static uint8_t clientRxBuffer[256], clientTxBuffer[256];
00070 
00071 // Serial used for printfs to terminal (i.e. NOT used for WiConnect)
00072 static Serial consoleSerial(STDIO_UART_TX, STDIO_UART_RX);
00073 
00074 
00075 
00076 //-------------------------------------------------------------------------
00077 // STEP 1: Instantiate WiConnect Library
00078 //-------------------------------------------------------------------------
00079 
00080 
00081 // Setup  wiconnect serial interface configuration
00082 // Here we only specify the rx buffer size and not rx buffer pointer, this means
00083 // The serial RX buffer will be dynamically allocated
00084 SerialConfig serialConfig(WICONNECT_RX_PIN, WICONNECT_TX_PIN, 256, NULL);
00085 
00086 // Instantiate the Wiconnect library
00087 // Here we specify the buffer size ONLY which means we're using dynmaic allocation
00088 Wiconnect wiconnectIfc(serialConfig, 256, NULL, WICONNECT_RESET_PIN);
00089 
00090 
00091 
00092 
00093 
00094 /******************************************************************************
00095  * Starting point of application
00096  */
00097 int main(int argc, char **argv)
00098 {
00099     WiconnectResult result;
00100     // Instantiate a client socket object with statically allocaed transmit/receive buffers
00101     // Note: this socket object isn't valid until tcpAccept() is called with in
00102     WiconnectSocket clientSocket(sizeof(clientRxBuffer), clientRxBuffer, sizeof(clientTxBuffer), clientTxBuffer);
00103 
00104     consoleSerial.baud(115200); // console terminal to 115200 baud
00105 
00106 
00107     //-------------------------------------------------------------------------
00108     // STEP 2: Initiate Communication with WiFi Module
00109     //-------------------------------------------------------------------------
00110 
00111     printf("Initializing WiConnect Library...\r\n");
00112 
00113     // Initialize communication with WiFi module
00114     if(WICONNECT_FAILED(result, wiconnectIfc.init(true)))
00115     {
00116         printf("Failed to initialize communication with WiFi module: %s\r\n"
00117                 "Make sure the wires are connected correctly\r\n", Wiconnect::getWiconnectResultStr(result));
00118         if(result == WICONNECT_FIRMWARE_OUTDATED)
00119         {
00120             printf("** The WiFi firmware is not supported. Run the ota example to update the firmware:\r\n");
00121             printf("https://developer.mbed.org/teams/ACKme/code/wiconnect-ota_example\r\n\r\n");
00122         }
00123         for(;;); // infinite loop
00124     }
00125 
00126     //-------------------------------------------------------------------------
00127     // STEP 3: Join the network
00128     //-------------------------------------------------------------------------
00129 
00130     printf("Joining WiFi network: %s\r\n", NETWORK_SSID);
00131 
00132     // Initialize communication with WiFi module
00133     if(WICONNECT_FAILED(result, wiconnectIfc.join(NETWORK_SSID, NETWORK_PASSWORD)))
00134     {
00135         printf("Failed to join network: %s\r\n", Wiconnect::getWiconnectResultStr(result));
00136         for(;;); // infinite loop
00137     }
00138 
00139 
00140     //-------------------------------------------------------------------------
00141     // STEP 4: Start the TCP server
00142     //-------------------------------------------------------------------------
00143 
00144     printf("Starting TCP server, listening on: %s:%d\r\n", wiconnectIfc.getIpAddress(), TCP_SERVER_PORT);
00145 
00146     if(WICONNECT_FAILED(result, wiconnectIfc.tcpListen(TCP_SERVER_PORT, TCP_SERVER_MAX_CLIENTS)))
00147     {
00148         printf("Failed to start TCP server: %s\r\n", Wiconnect::getWiconnectResultStr(result));
00149         for(;;); // infinite loop
00150     }
00151 
00152 
00153     for(;;)
00154     {
00155         //-------------------------------------------------------------------------
00156         // STEP 5: Wait for clients to connect
00157         //-------------------------------------------------------------------------
00158 
00159         printf("Waiting for a client to connect...\r\n");
00160 
00161         if(WICONNECT_FAILED(result, wiconnectIfc.tcpAccept(clientSocket)))
00162         {
00163             printf("Failed to accept client: %s\r\n", Wiconnect::getWiconnectResultStr(result));
00164             continue;
00165         }
00166         printf("Client connected: %s:%d\r\n", clientSocket.getHost(), clientSocket.getRemotePort());
00167 
00168         //-------------------------------------------------------------------------
00169         // STEP 6: Receive data from client
00170         //-------------------------------------------------------------------------
00171 
00172         uint8_t *dataPtr;   // pointer to client socket's internal RX buffer
00173         uint16_t readSize;  // will contain number of bytes available in RX buffer
00174         if(WICONNECT_FAILED(result, clientSocket.read(&dataPtr, &readSize)))
00175         {
00176             printf("Failed to read data from client: %s\r\n", Wiconnect::getWiconnectResultStr(result));
00177             clientSocket.close();
00178             continue;
00179         }
00180 
00181         printf("From client: %s\r\n", dataPtr);
00182 
00183 
00184         //-------------------------------------------------------------------------
00185         // STEP 7: Send data to client
00186         //-------------------------------------------------------------------------
00187 
00188         if(WICONNECT_FAILED(result, clientSocket.puts("Hello client!!\r\n")))
00189         {
00190             printf("Failed to send data to client: %s\r\n", Wiconnect::getWiconnectResultStr(result));
00191             clientSocket.close();
00192             continue;
00193         }
00194 
00195         //-------------------------------------------------------------------------
00196         // STEP 8: Close client connection
00197         //-------------------------------------------------------------------------
00198 
00199         clientSocket.close();
00200     }
00201 
00202 }
00203