Diff: main_linux.cpp

Revision:

3:7a6a899de7cc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_linux.cpp	Tue May 06 09:45:22 2014 +0000
@@ -0,0 +1,324 @@
+/*******************************************************************************
+ * Copyright (c) 2014 IBM Corp.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ *
+ * The Eclipse Public License is available at
+ *    http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ *   http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *    Ian Craggs - initial API and implementation and/or initial documentation
+ *******************************************************************************/
+  
+ /**
+  This is a sample program to illustrate the use of the MQTT Client library
+  on Linux.  The Client class requires two classes which mediate
+  access to system interfaces for networking and timing.  As long as these two
+  classes provide the required public programming interfaces, it does not matter
+  what facilities they use underneath. In this program, they use the Linux
+  system libraries.
+ 
+ */
+
+#if defined(LINUX)
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/select.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+
+#include "MQTTClient.h"
+#include "FP.cpp"
+
+#define DEFAULT_STACK_SIZE -1
+
+
+class IPStack 
+{
+public:    
+    IPStack()
+    {
+
+    }
+    
+	int Socket_error(const char* aString)
+	{
+
+		if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS && errno != EWOULDBLOCK)
+		{
+			if (strcmp(aString, "shutdown") != 0 || (errno != ENOTCONN && errno != ECONNRESET))
+				printf("Socket error %s in %s for socket %d\n", strerror(errno), aString, mysock);
+		}
+		return errno;
+	}
+
+    int connect(const char* hostname, int port)
+    {
+		int type = SOCK_STREAM;
+		struct sockaddr_in address;
+		int rc = -1;
+		sa_family_t family = AF_INET;
+		struct addrinfo *result = NULL;
+		struct addrinfo hints = {0, AF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, 0, NULL, NULL, NULL};
+
+		if ((rc = getaddrinfo(hostname, NULL, &hints, &result)) == 0)
+		{
+			struct addrinfo* res = result;
+
+			/* prefer ip4 addresses */
+			while (res)
+			{
+				if (res->ai_family == AF_INET)
+				{
+					result = res;
+					break;
+				}
+				res = res->ai_next;
+			}
+
+			if (result->ai_family == AF_INET)
+			{
+				address.sin_port = htons(port);
+				address.sin_family = family = AF_INET;
+				address.sin_addr = ((struct sockaddr_in*)(result->ai_addr))->sin_addr;
+			}
+			else
+				rc = -1;
+
+			freeaddrinfo(result);
+		}
+
+		if (rc == 0)
+		{
+			mysock = socket(family, type, 0);
+			if (mysock != -1)
+			{
+				int opt = 1;
+
+				//if (setsockopt(mysock, SOL_SOCKET, SO_NOSIGPIPE, (void*)&opt, sizeof(opt)) != 0)
+				//	printf("Could not set SO_NOSIGPIPE for socket %d", mysock);
+				
+				rc = ::connect(mysock, (struct sockaddr*)&address, sizeof(address));
+			}
+		}
+
+        return rc;
+    }
+
+    int read(char* buffer, int len, int timeout_ms)
+    {
+		struct timeval interval = {timeout_ms / 1000, (timeout_ms % 1000) * 1000};
+		if (interval.tv_sec < 0 || (interval.tv_sec == 0 && interval.tv_usec <= 0))
+		{
+			interval.tv_sec = 0;
+			interval.tv_usec = 100;
+		}
+
+		setsockopt(mysock, SOL_SOCKET, SO_RCVTIMEO, (char *)&interval, sizeof(struct timeval));
+
+		//printf("reading %d bytes\n", len);
+		int rc = ::recv(mysock, buffer, (size_t)len, 0);
+		if (rc == -1)
+			Socket_error("read");
+		//printf("read %d bytes\n", rc);
+		return rc;
+    }
+    
+    int write(char* buffer, int len, int timeout)
+    {
+		struct timeval tv;
+
+		tv.tv_sec = 0;  /* 30 Secs Timeout */
+		tv.tv_usec = timeout * 1000;  // Not init'ing this can cause strange errors
+
+		setsockopt(mysock, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv,sizeof(struct timeval));
+		int	rc = ::write(mysock, buffer, len);
+		//printf("write rc %d\n", rc);
+		return rc;
+    }
+
+	int disconnect()
+	{
+		return ::close(mysock);
+	}
+    
+private:
+
+    int mysock; 
+    
+};
+
+
+class Countdown
+{
+public:
+    Countdown()
+    { 
+	
+    }
+
+    Countdown(int ms)
+    { 
+		countdown_ms(ms);
+    }
+    
+
+    bool expired()
+    {
+		struct timeval now, res;
+		gettimeofday(&now, NULL);
+		timersub(&end_time, &now, &res);		
+		//printf("left %d ms\n", (res.tv_sec < 0) ? 0 : res.tv_sec * 1000 + res.tv_usec / 1000);
+		//if (res.tv_sec > 0 || res.tv_usec > 0)
+		//	printf("expired %d %d\n", res.tv_sec, res.tv_usec);
+        return res.tv_sec < 0 || (res.tv_sec == 0 && res.tv_usec <= 0);
+    }
+    
+
+    void countdown_ms(int ms)  
+    {
+		struct timeval now;
+		gettimeofday(&now, NULL);
+		struct timeval interval = {ms / 1000, (ms % 1000) * 1000};
+		//printf("interval %d %d\n", interval.tv_sec, interval.tv_usec);
+		timeradd(&now, &interval, &end_time);
+    }
+
+    
+    void countdown(int seconds)
+    {
+		struct timeval now;
+		gettimeofday(&now, NULL);
+		struct timeval interval = {seconds, 0};
+		timeradd(&now, &interval, &end_time);
+    }
+
+    
+    int left_ms()
+    {
+		struct timeval now, res;
+		gettimeofday(&now, NULL);
+		timersub(&end_time, &now, &res);
+		//printf("left %d ms\n", (res.tv_sec < 0) ? 0 : res.tv_sec * 1000 + res.tv_usec / 1000);
+        return (res.tv_sec < 0) ? 0 : res.tv_sec * 1000 + res.tv_usec / 1000;
+    }
+    
+private:
+
+	struct timeval end_time;
+};
+
+
+int arrivedcount = 0;
+
+void messageArrived(MQTT::Message* message)
+{
+	printf("Message %d arrived: qos %d, retained %d, dup %d, packetid %d\n", 
+		++arrivedcount, message->qos, message->retained, message->dup, message->id);
+    printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
+}
+
+
+int connect(MQTT::Client<IPStack, Countdown>::connectionLostInfo* info)
+{
+    const char* hostname = "localhost"; //"m2m.eclipse.org";
+    int port = 1883;
+    printf("Connecting to %s:%d\n", hostname, port);
+    int rc = info->network->connect(hostname, port);
+	if (rc != 0)
+	    printf("rc from TCP connect is %d\n", rc);
+ 
+    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
+    data.MQTTVersion = 3;
+    data.clientID.cstring = (char*)"mbed-icraggs";
+    rc = info->client->connect(&data);
+	if (rc != 0)
+	    printf("rc from MQTT connect is %d\n", rc);
+    
+    return rc;
+}
+
+
+int main(int argc, char* argv[])
+{   
+    IPStack ipstack = IPStack();
+    float version = 0.3;
+    const char* topic = "mbed-sample";
+    
+    printf("Version is %f\n", version);
+              
+    MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack);
+    
+    client.setConnectionLostHandler(connect);
+
+    MQTT::Client<IPStack, Countdown>::connectionLostInfo info = {&client, &ipstack};
+    int rc = connect(&info);
+    
+    rc = client.subscribe(topic, MQTT::QOS2, messageArrived);   
+    if (rc != 0)
+        printf("rc from MQTT subscribe is %d\n", rc);
+
+    MQTT::Message message;
+
+    // QoS 0
+    char buf[100];
+    sprintf(buf, "Hello World!  QoS 0 message from app version %f", version);
+    message.qos = MQTT::QOS0;
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf;
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, &message);
+    while (arrivedcount == 0)
+        client.yield(100);
+        
+    // QoS 1
+	printf("Now QoS 1\n");
+    sprintf(buf, "Hello World!  QoS 1 message from app version %f", version);
+    message.qos = MQTT::QOS1;
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, &message);
+    while (arrivedcount == 1)
+        client.yield(100);
+        
+    // QoS 2
+    sprintf(buf, "Hello World!  QoS 2 message from app version %f", version);
+    message.qos = MQTT::QOS2;
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, &message);
+    while (arrivedcount == 2)
+        client.yield(100);
+    
+    rc = client.unsubscribe(topic);
+    if (rc != 0)
+        printf("rc from unsubscribe was %d\n", rc);
+    
+    rc = client.disconnect();
+    if (rc != 0)
+        printf("rc from disconnect was %d\n", rc);
+    
+    ipstack.disconnect();
+    
+    printf("Finishing with %d messages received\n", arrivedcount);
+    
+    return 0;
+}
+
+#endif