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Author: Sergio R. Caprile <scaprile@gmail.com>

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moved all common socket support functions to a new file
(transport).
added new samples to show specific actions.

Signed-off-by: Sergio R. Caprile <scaprile@gmail.com>
This commit is contained in:
Sergio R. Caprile
2014-09-05 10:42:21 -03:00
parent b54b6a8a77
commit efede2d9f9
9 changed files with 471 additions and 419 deletions
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136
samples/pub0sub1.c
View File

@@ -12,111 +12,25 @@
*
* Contributors:
* Ian Craggs - initial API and implementation and/or initial documentation
* Sergio R. Caprile - clarifications and/or documentation extension
*
* Description:
* Normal topic name is automatically registered at subscription, then
* a message is published and the node receives it itself
*******************************************************************************/
#include "MQTTSNPacket.h"
#if !defined(SOCKET_ERROR)
/** error in socket operation */
#define SOCKET_ERROR -1
#endif
#if defined(WIN32)
/* default on Windows is 64 - increase to make Linux and Windows the same */
#define FD_SETSIZE 1024
#include <winsock2.h>
#include <ws2tcpip.h>
#define MAXHOSTNAMELEN 256
#define EAGAIN WSAEWOULDBLOCK
#define EINTR WSAEINTR
#define EINVAL WSAEINVAL
#define EINPROGRESS WSAEINPROGRESS
#define EWOULDBLOCK WSAEWOULDBLOCK
#define ENOTCONN WSAENOTCONN
#define ECONNRESET WSAECONNRESET
#define ioctl ioctlsocket
#define socklen_t int
#else
#define INVALID_SOCKET SOCKET_ERROR
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/time.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 <string.h>
#include <stdlib.h>
#endif
#if defined(WIN32)
#include <Iphlpapi.h>
#else
#include <sys/ioctl.h>
#include <net/if.h>
#endif
int Socket_error(char* aString, int sock)
{
#if defined(WIN32)
int errno;
#endif
#if defined(WIN32)
errno = WSAGetLastError();
#endif
if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS && errno != EWOULDBLOCK)
{
if (strcmp(aString, "shutdown") != 0 || (errno != ENOTCONN && errno != ECONNRESET))
{
int orig_errno = errno;
char* errmsg = strerror(errno);
printf("Socket error %d (%s) in %s for socket %d\n", orig_errno, errmsg, aString, sock);
}
}
return errno;
}
int sendPacketBuffer(int asocket, char* host, int port, unsigned char* buf, int buflen)
{
struct sockaddr_in cliaddr;
int rc = 0;
memset(&cliaddr, 0, sizeof(cliaddr));
cliaddr.sin_family = AF_INET;
cliaddr.sin_addr.s_addr = inet_addr(host);
cliaddr.sin_port = htons(port);
if ((rc = sendto(asocket, buf, buflen, 0, (const struct sockaddr*)&cliaddr, sizeof(cliaddr))) == SOCKET_ERROR)
Socket_error("sendto", asocket);
else if (rc == buflen)
rc = 0;
return rc;
}
int mysock = 0;
char *host = "127.0.0.1";
int port = 1884;
int getdata(unsigned char* buf, int count)
{
int rc = recvfrom(mysock, buf, count, 0, NULL, NULL);
printf("received %d bytes count %d\n", rc, (int)count);
return rc;
}
#include "MQTTSNPacket.h"
#include "transport.h"
int main(int argc, char** argv)
{
int rc = 0;
int mysock;
unsigned char buf[200];
int buflen = sizeof(buf);
MQTTSN_topicid topic;
@@ -128,9 +42,15 @@ int main(int argc, char** argv)
unsigned char retained = 0;
short packetid = 1;
char *topicname = "a long topic name";
char *host = "127.0.0.1";
int port = 1883;
MQTTSNPacket_connectData options = MQTTSNPacket_connectData_initializer;
unsigned short topicid;
mysock = transport_open();
if(mysock < 0)
return mysock;
if (argc > 1)
host = argv[1];
@@ -139,16 +59,12 @@ int main(int argc, char** argv)
printf("Sending to hostname %s port %d\n", host, port);
mysock = socket(AF_INET, SOCK_DGRAM, 0);
if (mysock == INVALID_SOCKET)
rc = Socket_error("socket", mysock);
options.clientID.cstring = "pub0sub1 MQTT-SN";
len = MQTTSNSerialize_connect(buf, buflen, &options);
rc = sendPacketBuffer(mysock, host, port, buf, len);
rc = transport_sendPacketBuffer(host, port, buf, len);
/* wait for connack */
if (MQTTSNPacket_read(buf, buflen, getdata) == MQTTSN_CONNACK)
if (MQTTSNPacket_read(buf, buflen, transport_getdata) == MQTTSN_CONNACK)
{
int connack_rc = -1;
@@ -169,10 +85,10 @@ int main(int argc, char** argv)
topic.type = MQTTSN_TOPIC_TYPE_NORMAL;
topic.data.long_.name = topicname;
topic.data.long_.len = strlen(topic.data.long_.name);
len = MQTTSNSerialize_subscribe(buf, buflen, 0, 2, /*msgid*/ 1, &topic);
rc = sendPacketBuffer(mysock, host, port, buf, len);
len = MQTTSNSerialize_subscribe(buf, buflen, 0, 2, packetid, &topic);
rc = transport_sendPacketBuffer(host, port, buf, len);
if (MQTTSNPacket_read(buf, buflen, getdata) == MQTTSN_SUBACK) /* wait for suback */
if (MQTTSNPacket_read(buf, buflen, transport_getdata) == MQTTSN_SUBACK) /* wait for suback */
{
unsigned short submsgid;
int granted_qos;
@@ -194,12 +110,13 @@ int main(int argc, char** argv)
/* publish with short name */
topic.type = MQTTSN_TOPIC_TYPE_NORMAL;
topic.data.id = topicid;
++packetid;
len = MQTTSNSerialize_publish(buf, buflen, dup, qos, retained, packetid,
topic, payload, payloadlen);
rc = sendPacketBuffer(mysock, host, port, buf, len);
rc = transport_sendPacketBuffer(host, port, buf, len);
/* wait for puback */
if (MQTTSNPacket_read(buf, buflen, getdata) == MQTTSN_PUBACK)
if (MQTTSNPacket_read(buf, buflen, transport_getdata) == MQTTSN_PUBACK)
{
unsigned short packet_id, topic_id;
unsigned char returncode;
@@ -213,7 +130,7 @@ int main(int argc, char** argv)
goto exit;
printf("Receive publish\n");
if (MQTTSNPacket_read(buf, buflen, getdata) == MQTTSN_PUBLISH)
if (MQTTSNPacket_read(buf, buflen, transport_getdata) == MQTTSN_PUBLISH)
{
unsigned short packet_id;
int qos, payloadlen;
@@ -230,7 +147,7 @@ int main(int argc, char** argv)
if (qos == 1)
{
len = MQTTSNSerialize_puback(buf, buflen, pubtopic.data.id, packet_id, MQTTSN_RC_ACCEPTED);
rc = sendPacketBuffer(mysock, host, port, buf, len);
rc = transport_sendPacketBuffer(host, port, buf, len);
if (rc == 0)
printf("puback sent\n");
}
@@ -239,11 +156,10 @@ int main(int argc, char** argv)
goto exit;
len = MQTTSNSerialize_disconnect(buf, buflen, 0);
rc = sendPacketBuffer(mysock, host, port, buf, len);
rc = transport_sendPacketBuffer(host, port, buf, len);
exit:
rc = shutdown(mysock, SHUT_WR);
rc = close(mysock);
transport_close();
return 0;
}