74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
#include <stdio.h>
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#include <mosquitto.h>
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void my_message_callback(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *message)
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{
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if(message->payloadlen){
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printf("%s %s\n", message->topic, message->payload);
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}else{
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printf("%s (null)\n", message->topic);
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}
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fflush(stdout);
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}
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void my_connect_callback(struct mosquitto *mosq, void *userdata, int result)
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{
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int i;
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if(!result){
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/* Subscribe to broker information topics on successful connect. */
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//mosquitto_subscribe(mosq, NULL, "$SYS/#", 2);
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mosquitto_subscribe(mosq, NULL, "testtopic", 2);
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}else{
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fprintf(stderr, "Connect failed\n");
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}
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}
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void my_subscribe_callback(struct mosquitto *mosq, void *userdata, int mid, int qos_count, const int *granted_qos)
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{
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int i;
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printf("Subscribed (mid: %d): %d", mid, granted_qos[0]);
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for(i=1; i<qos_count; i++){
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printf(", %d", granted_qos[i]);
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}
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printf("\n");
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}
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void my_log_callback(struct mosquitto *mosq, void *userdata, int level, const char *str)
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{
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/* Pring all log messages regardless of level. */
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printf("%s\n", str);
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}
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int main(int argc, char *argv[])
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{
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int i;
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char *host = "localhost";
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int port = 1883;
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int keepalive = 60;
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bool clean_session = true;
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struct mosquitto *mosq = NULL;
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mosquitto_lib_init();
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mosq = mosquitto_new(NULL, clean_session, NULL);
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if(!mosq){
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fprintf(stderr, "Error: Out of memory.\n");
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return 1;
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}
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mosquitto_log_callback_set(mosq, my_log_callback);
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mosquitto_connect_callback_set(mosq, my_connect_callback);
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mosquitto_message_callback_set(mosq, my_message_callback);
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mosquitto_subscribe_callback_set(mosq, my_subscribe_callback);
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if(mosquitto_connect(mosq, host, port, keepalive)){
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fprintf(stderr, "Unable to connect.\n");
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return 1;
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}
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mosquitto_loop_forever(mosq, -1, 1);
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mosquitto_destroy(mosq);
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mosquitto_lib_cleanup();
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return 0;
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} |