Diff: samples/publish-subscribe.txt

Revision:

2:bc3bc0e3b764

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/publish-subscribe.txt	Thu Apr 10 15:11:16 2014 +0000
@@ -0,0 +1,115 @@
+#include "MQTTPacket.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "EthernetInterface.h"
+
+
+TCPSocketConnection mysock; 
+
+int getdata(char* buf, int count)
+{
+    return mysock.receive(buf, (size_t)count);
+}
+
+int toStop = 0;
+
+
+int main()
+{
+    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
+    int rc = 0;
+    char buf[200];
+    int buflen = sizeof(buf);
+    int msgid = 1;
+    MQTTString topicString = MQTTString_initializer;
+    int req_qos = 0;
+    char* payload = "mypayload";
+    int payloadlen = strlen(payload);
+    int len = 0;
+    EthernetInterface eth;
+    
+    eth.init(); //Use DHCP
+    eth.connect();
+
+    rc = mysock.connect("m2m.eclipse.org", 1883);
+
+    data.clientID.cstring = "SendReceive mbed MQTT ";
+    data.keepAliveInterval = 20;
+    data.cleansession = 1;
+
+    mysock.set_blocking(true, 1000);  /* 1 second Timeout */
+
+    len = MQTTSerialize_connect(buf, buflen, &data);
+    rc = mysock.send(buf, len);
+
+    /* wait for connack */
+    if (MQTTPacket_read(buf, buflen, getdata) == CONNACK)
+    {
+        int connack_rc;
+
+        if (MQTTDeserialize_connack(&connack_rc, buf, buflen) != 1 || connack_rc != 0)
+        {
+            printf("Unable to connect, return code %d\n", connack_rc);
+            goto exit;
+        }
+    }
+    else
+        goto exit;
+
+    /* subscribe */
+    topicString.cstring = "substopic";
+    len = MQTTSerialize_subscribe(buf, buflen, 0, msgid, 1, &topicString, &req_qos);
+
+    rc = mysock.send(buf, len);
+    if (MQTTPacket_read(buf, buflen, getdata) == SUBACK)    /* wait for suback */
+    {
+        int submsgid;
+        int subcount;
+        int granted_qos;
+
+        rc = MQTTDeserialize_suback(&submsgid, 1, &subcount, &granted_qos, buf, buflen);
+        if (granted_qos != 0)
+        {
+            printf("granted qos != 0, %d\n", granted_qos);
+            goto exit;
+        }
+    }
+    else
+        goto exit;
+
+    topicString.cstring = "pubtopic";
+    while (!toStop)
+    {
+        if (MQTTPacket_read(buf, buflen, getdata) == PUBLISH)
+        {
+            int dup;
+            int qos;
+            int retained;
+            int msgid;
+            int payloadlen_in;
+            char* payload_in;
+            int rc;
+            MQTTString receivedTopic;
+
+            rc = MQTTDeserialize_publish(&dup, &qos, &retained, &msgid, &receivedTopic,
+                    &payload_in, &payloadlen_in, buf, buflen);
+            printf("message arrived %.*s\n", payloadlen_in, payload_in);
+        }
+
+        printf("publishing reading\n");
+        len = MQTTSerialize_publish(buf, buflen, 0, 0, 0, 0, topicString, payload, payloadlen);
+        rc = mysock.send(buf, len);
+    }
+
+    printf("disconnecting\n");
+    len = MQTTSerialize_disconnect(buf, buflen);
+    rc = mysock.send(buf, len);
+
+exit:    
+    eth.disconnect();
+
+    return 0;
+}