Diff: Socket/UDPSocket.cpp

Revision:

1:fb4494783863

Child:

4:0bcec6272784

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Socket/UDPSocket.cpp	Fri Aug 24 13:48:36 2012 +0000
@@ -0,0 +1,166 @@
+/* Copyright (C) 2012 mbed.org, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "UDPSocket.h"
+
+#include <string>
+#include <algorithm>
+
+UDPSocket::UDPSocket()
+{
+    endpoint_configured = false;
+    endpoint_read = false;
+}
+
+int UDPSocket::init(void)
+{
+    wifi->setProtocol(UDP);
+    wifi->exit();
+    return 0;
+}
+
+// Server initialization
+int UDPSocket::bind(int port)
+{
+    char cmd[17];
+    
+    // set udp protocol
+    wifi->setProtocol(UDP);
+    
+    // set local port
+    sprintf(cmd, "set i l %d\r", port);
+    if (!wifi->sendCommand(cmd, "AOK"))
+        return -1;
+    wifi->exit();
+    return 0;
+}
+
+// -1 if unsuccessful, else number of bytes written
+int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
+{
+    Timer tmr;
+    int idx = 0;
+
+    confEndpoint(remote);
+
+    tmr.start();
+
+    while ((tmr.read_ms() < _timeout) || _blocking) {
+
+        idx += wifi->send(packet, length);
+
+        if (idx == length)
+            return idx;
+    }
+    return (idx == 0) ? -1 : idx;
+}
+
+// -1 if unsuccessful, else number of bytes received
+int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
+{
+    Timer tmr;
+    int idx = 0;
+    int nb_available = 0;
+    int time = -1;
+
+    if (_blocking) {
+        while (1) {
+            nb_available = wifi->readable();
+            if (nb_available != 0) {
+                break;
+            }
+        }
+    }
+
+    tmr.start();
+
+    while (time < _timeout) {
+
+        nb_available = wifi->readable();
+        for (int i = 0; i < min(nb_available, length); i++) {
+            buffer[idx] = wifi->getc();
+            idx++;
+        }
+
+        if (idx == length) {
+            break;
+        }
+        
+        time = tmr.read_ms();
+    }
+
+    readEndpoint(remote);
+    return (idx == 0) ? -1 : idx;
+}
+
+bool UDPSocket::confEndpoint(Endpoint & ep)
+{
+    char * host;
+    char cmd[30];
+    if (!endpoint_configured) {
+        host = ep.get_address();
+        if (host[0] != '\0') {
+            // set host
+            sprintf(cmd, "set i h %s\r", host);
+            if (!wifi->sendCommand(cmd, "AOK"))
+                return false;
+                
+            // set remote port
+            sprintf(cmd, "set i r %d\r", ep.get_port());
+            if (!wifi->sendCommand(cmd, "AOK"))
+                return false;
+                
+            wifi->exit();
+            endpoint_configured = true;
+            return true;
+        }
+    }
+    return true;
+}
+
+bool UDPSocket::readEndpoint(Endpoint & ep)
+{
+    char recv[256];
+    int begin = 0;
+    int end = 0;
+    string str;
+    string addr;
+    int port;
+    if (!endpoint_read) {
+        if (!wifi->sendCommand("get ip\r", NULL, recv))
+            return false;
+        wifi->exit();
+        str = recv;
+        begin = str.find("HOST=");
+        end = str.find("PROTO=");
+        if (begin != string::npos && end != string::npos) {
+            str = str.substr(begin + 5, end - begin - 5);
+            int pos = str.find(":");
+            if (pos != string::npos) {
+                addr = str.substr(0, pos);
+                port = atoi(str.substr(pos + 1).c_str());
+                ep.set_address(addr.c_str(), port);
+                endpoint_read = true;
+                wifi->flush();
+                return true;
+            }
+        }
+        wifi->flush();
+    }
+    return false;
+}