-
Notifications
You must be signed in to change notification settings - Fork 0
/
mqttPublisher.c
314 lines (262 loc) · 8 KB
/
mqttPublisher.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/*******************************************************************************
* Copyright (c) 2014 IBM Corporation and other Contributors.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* rajathr1 - Initial Contribution
* timroster - change subscription to run commands based on time_delay value
*
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTAsync.h"
#include <syslog.h>
#define DEBUG 1 //make this 1 for debugging
#ifdef DEBUG
#define ERROR 1
#define WARN 1
#define INFO 1
#define FINE 1
#else
#define ERROR 1
#define WARN 1
#define INFO 0
#define FINE 0
#endif
#define QOS 0
#define TRUSTSTORE "/opt/iot/IoTFoundation.pem"
/* this maintains the status of connection
* 0 - Not connected
* 1 - Connected
* -1 - Connection Failed, retry
*/
int connected = 0;
volatile MQTTAsync_token deliveredtoken;
//for parsing the json
int getDelay(char *text);
/*
* This function is called when the message is successfully published
*/
void onSend(void* context, MQTTAsync_successData* response) {
#ifdef FINE
syslog(LOG_DEBUG, "Event with token value %d delivery confirmed\n",
response->token);
#endif
}
/*
* This function is called when the subscription succeeds
*/
void onSubscription(void* context, MQTTAsync_successData* response) {
#ifdef FINE
syslog(LOG_INFO, "Subscription succeeded\n");
#endif
}
/*
* Called when the connection is successful. Update the connected variable
*/
void onConnectSuccess(void* context, MQTTAsync_successData* response) {
#ifdef FINE
syslog(LOG_INFO, "Connection was successful\n");
#endif
// The connection is successful. update it to 1
connected = 1;
}
/*
* After sending the message disconnect from IoT/mqtt server
*/
int disconnect_mqtt_client(MQTTAsync* client) {
MQTTAsync_disconnectOptions opts = MQTTAsync_disconnectOptions_initializer;
int rc = MQTTASYNC_SUCCESS;
opts.context = client;
if ((rc = MQTTAsync_disconnect(client, &opts)) != MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to start sendMessage, return code %d\n", rc);
#endif
}
MQTTAsync_destroy(client);
return rc;
}
/*
* On failure of connection to server, print the response code
*/
void onConnectFailure(void* context, MQTTAsync_failureData* response) {
#ifdef ERROR
syslog(LOG_ERR, "Connect failed ");
if (response) {
syslog(LOG_ERR, "with response code : %d and with message : %s", response->code, response->message);
}
#endif
connected = -1; // connection has failed
}
/*
* Function to process the subscribed messages
*/
int subscribeMessage(void *context, char *topicName, int topicLen,
MQTTAsync_message *message) {
int i;
char* payloadptr;
char* command;
int time_delay = 0;
payloadptr = message->payload;
time_delay = getDelay(payloadptr);
/*
* if(time_delay != -1) {
* sprintf(command,"sudo /sbin/shutdown -r %d", time_delay);
* syslog(LOG_INFO, "Received command to restart in %d minutes.",time_delay);
* system(command);
* } else
* syslog(LOG_ERR, "Invalid command received.");
*
*/
if(time_delay == 1) {
system("sudo /usr/bin/python /home/pi/led.py red");
}
if(time_delay == 2) {
system("sudo /usr/bin/python /home/pi/led.py yellow");
}
if(time_delay == 3) {
system("sudo /usr/bin/python /home/pi/led.py green");
}
MQTTAsync_freeMessage(&message);
MQTTAsync_free(topicName);
return 1;
}
/*
* Try to reconnect if the connection is lost
*/
void connlost(void *context, char *cause) {
MQTTAsync client = (MQTTAsync)context;
int rc;
#ifdef ERROR
syslog(LOG_ERR, "Connection lost\n");
syslog(LOG_ERR, " cause: %s\n", cause);
#endif
syslog(LOG_INFO, "Retrying the connection\n");
MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
conn_opts.keepAliveInterval = 20;
conn_opts.cleansession = 1;
conn_opts.onSuccess = onConnectSuccess;
conn_opts.onFailure = onConnectFailure;
conn_opts.context = &client;
syslog(LOG_INFO, "Retrying the connection -1 \n");
if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to start connect from connlost, return code %d\n", rc);
#endif
}
}
/*
* Function is used to initialize the MQTT connection handle "client"
*/
int init_mqtt_connection(MQTTAsync* client, char *address, int isRegistered,
char* client_id, char* username, char* passwd) {
MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
MQTTAsync_SSLOptions sslopts = MQTTAsync_SSLOptions_initializer;
int rc = MQTTASYNC_SUCCESS;
MQTTAsync_create(client, address, client_id, MQTTCLIENT_PERSISTENCE_NONE,
NULL);
MQTTAsync_setCallbacks(*client, NULL, NULL, subscribeMessage, NULL);
#ifdef INFO
syslog(LOG_INFO, "Connecting to %s with client Id: %s \n", address,
client_id);
#endif
conn_opts.keepAliveInterval = 20;
conn_opts.cleansession = 1;
conn_opts.onSuccess = onConnectSuccess;
conn_opts.onFailure = onConnectFailure;
conn_opts.context = client;
//only when in registered mode, set the username/passwd and enable TLS
if (isRegistered) {
//currently only supported mech is token based. Need to change this in future.
conn_opts.username = username;
conn_opts.password = passwd;
sslopts.trustStore = TRUSTSTORE;
sslopts.enableServerCertAuth = 1;
conn_opts.ssl = &sslopts;
}
if ((rc = MQTTAsync_connect(*client, &conn_opts)) != MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to start connect, return code %d\n", rc);
#endif
}
return rc;
}
int reconnect(MQTTAsync* client, int isRegistered,
char* username, char* passwd) {
syslog(LOG_INFO, "Retrying the connection\n");
MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
MQTTAsync_SSLOptions sslopts = MQTTAsync_SSLOptions_initializer;
conn_opts.keepAliveInterval = 20;
conn_opts.cleansession = 1;
conn_opts.onSuccess = onConnectSuccess;
conn_opts.onFailure = onConnectFailure;
conn_opts.context = client;
int rc;
//only when in registered mode, set the username/passwd and enable TLS
if (isRegistered) {
//currently only supported mech is token based. Need to change this in future.
syslog(LOG_INFO, "with SSL properties\n");
conn_opts.username = username;
conn_opts.password = passwd;
sslopts.trustStore = TRUSTSTORE;
sslopts.enableServerCertAuth = 0;
conn_opts.ssl = &sslopts;
}
if ((rc = MQTTAsync_connect(*client, &conn_opts)) != MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to start connect, return code %d\n", rc);
#endif
}
return rc;
}
int subscribe(MQTTAsync* client, char *topic) {
MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
int rc = MQTTASYNC_SUCCESS;
opts.onSuccess = onSubscription;
opts.context = *client;
if ((rc = MQTTAsync_subscribe(*client, topic, QOS, &opts))
!= MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to subscribe, return code %d\n", rc);
#endif
return rc;
}
#ifdef INFO
syslog(LOG_DEBUG, "Waiting for subscription "
"on topic %s\n", topic);
#endif
return rc;
}
/*
* Function is used to publish events to the IoT MQTT reciver.
* This reuses the "client"
*/
int publishMQTTMessage(MQTTAsync* client, char *topic, char *payload) {
MQTTAsync_message pubmsg = MQTTAsync_message_initializer;
MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
int rc = MQTTASYNC_SUCCESS;
opts.onSuccess = onSend;
opts.context = *client;
pubmsg.payload = payload;
pubmsg.payloadlen = strlen(payload);
pubmsg.qos = QOS;
pubmsg.retained = 0;
deliveredtoken = 0;
if ((rc = MQTTAsync_sendMessage(*client, topic, &pubmsg, &opts))
!= MQTTASYNC_SUCCESS) {
#ifdef ERROR
syslog(LOG_ERR, "Failed to start sendMessage, return code %d\n", rc);
#endif
return rc;
}
#ifdef INFO
syslog(LOG_DEBUG, "Waiting for publication of %s on topic %s\n", payload,
topic);
#endif
return rc;
}