115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
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/*
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* mqtt subscribe
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*
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* @build make examples
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* @sub bin/mqtt_sub 127.0.0.1 1883 topic
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* @pub bin/mqtt_pub 127.0.0.1 1883 topic payload
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*
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*/
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#include "hv.h"
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#include "mqtt_client.h"
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/*
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* @test MQTTS
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* #define TEST_SSL 1
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*
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* @build ./configure --with-mqtt --with-openssl && make clean && make
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*
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*/
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#define TEST_SSL 0
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#define TEST_AUTH 0
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#define TEST_RECONNECT 1
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/*
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* workflow:
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* mqtt_client_new -> mqtt_client_xxx -> mqtt_client_run
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*
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* mqtt_client_set_xxx ->
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* mqtt_client_connect ->
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* on_connack -> mqtt_client_subscribe ->
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* on_publish -> handle_message
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*
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*/
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static void handle_message(mqtt_client_t* cli, mqtt_message_t* msg) {
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printf("topic: %.*s\n", msg->topic_len, msg->topic);
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printf("payload: %.*s\n", msg->payload_len, msg->payload);
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}
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static void on_mqtt(mqtt_client_t* cli, int type) {
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printf("on_mqtt type=%d\n", type);
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switch(type) {
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case MQTT_TYPE_CONNECT:
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printf("mqtt connected!\n");
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if (cli->reconn_setting && cli->reconn_setting->cur_retry_cnt > 0) {
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printf("mqtt reconnect cnt=%d, delay=%d\n", cli->reconn_setting->cur_retry_cnt, cli->reconn_setting->cur_delay);
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}
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break;
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case MQTT_TYPE_DISCONNECT:
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printf("mqtt disconnected!\n");
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if (cli->reconn_setting && cli->reconn_setting->cur_retry_cnt > 0) {
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printf("mqtt reconnect cnt=%d, delay=%d\n", cli->reconn_setting->cur_retry_cnt, cli->reconn_setting->cur_delay);
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}
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break;
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case MQTT_TYPE_CONNACK:
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printf("mqtt connack!\n");
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{
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const char* topic = (const char*)mqtt_client_get_userdata(cli);
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int mid = mqtt_client_subscribe(cli, topic, 0);
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printf("mqtt subscribe mid=%d\n", mid);
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}
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break;
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case MQTT_TYPE_SUBACK:
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printf("mqtt suback mid=%d\n", cli->mid);
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break;
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case MQTT_TYPE_PUBLISH:
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handle_message(cli, &cli->message);
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default:
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break;
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}
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}
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static int mqtt_subscribe(const char* host, int port, const char* topic) {
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mqtt_client_t* cli = mqtt_client_new(NULL);
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if (cli == NULL) return -1;
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cli->keepalive = 10;
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#if TEST_AUTH
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mqtt_client_set_auth(cli, "test", "123456");
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#endif
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mqtt_client_set_userdata(cli, (void*)topic);
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mqtt_client_set_callback(cli, on_mqtt);
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#if TEST_RECONNECT
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reconn_setting_t reconn;
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reconn_setting_init(&reconn);
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reconn.min_delay = 1000;
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reconn.max_delay = 10000;
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reconn.delay_policy = 2;
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mqtt_client_set_reconnect(cli, &reconn);
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#endif
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int ssl = 0;
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#if TEST_SSL
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ssl = 1;
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#endif
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mqtt_client_connect(cli, host, port, ssl);
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mqtt_client_run(cli);
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mqtt_client_free(cli);
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return 0;
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}
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int main(int argc, char** argv) {
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if (argc < 4) {
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printf("Usage: %s host port topic\n", argv[0]);
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return -10;
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}
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const char* host = argv[1];
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int port = atoi(argv[2]);
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const char* topic = argv[3];
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return mqtt_subscribe(host, port, topic);
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}
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