/*
* Publishes a message to a topic.
*
* Args:
* - `topic`: topic, string.
* - `message`: message, string.
*
* Only QOS 0 is implemented at the moment.
*/
enum v7_err MQTT_publish(struct v7 *v7, v7_val_t *res) {
enum v7_err rcode = V7_OK;
struct user_data *ud;
struct mg_connection *nc;
const char *topic;
const char *message;
size_t message_len;
v7_val_t topicv = v7_arg(v7, 0), messagev = v7_arg(v7, 1);
(void) res;
topic = v7_get_cstring(v7, &topicv);
if (topic == NULL || strlen(topic) == 0) {
rcode = v7_throwf(v7, "TypeError", "invalid topic");
goto clean;
}
if (!v7_is_string(messagev)) {
rcode = v7_throwf(v7, "TypeError", "invalid message");
goto clean;
}
message = v7_get_string(v7, &messagev, &message_len);
nc = v7_get_ptr(v7, v7_get(v7, v7_get_this(v7), "_nc", ~0));
if (nc == NULL) {
rcode = v7_throwf(v7, "Error", "invalid connection");
goto clean;
}
ud = (struct user_data *) nc->user_data;
mg_mqtt_publish(nc, topic, ud->msgid++, MG_MQTT_QOS(0), message, message_len);
clean:
return rcode;
}
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
struct mg_mqtt_message *msg = (struct mg_mqtt_message *) p;
static int count1 = 0;
switch (ev) {
case MG_EV_CONNECT:
if (*(int *) p != 0) {
SYS_PRINT("Failed to connect to %s\r\n", MQTT_BROKER_ADDRESS);
} else {
SYS_PRINT("Connected to %s\r\n", MQTT_BROKER_ADDRESS);
}
struct mg_send_mqtt_handshake_opts opts;
memset(&opts, 0, sizeof(opts));
opts.user_name = MQTT_USER_NAME;
opts.password = MQTT_USER_PWD;
mg_set_protocol_mqtt(nc);
mg_send_mqtt_handshake_opt(nc, "PIC32", opts);
break;
case MG_EV_MQTT_CONNACK:
if (msg->connack_ret_code != MG_EV_MQTT_CONNACK_ACCEPTED) {
SYS_PRINT("Got mqtt connection error %d\n\r", msg->connack_ret_code);
} else {
SYS_PRINT("Connected to broker\n\r");
}
SYS_PRINT("Subscribing to /test\n\r");
mg_mqtt_subscribe(nc, topic_expressions,
sizeof(topic_expressions) / sizeof(*topic_expressions),
++msg_id);
nc->flags |= MG_F_USER_1;
break;
case MG_EV_MQTT_SUBACK:
SYS_PRINT("Subscription acknowledged\r\n");
break;
case MG_EV_MQTT_PUBLISH:
SYS_PRINT("Got incoming message %s: %.*s\r\n", msg->topic,
(int) msg->payload.len, msg->payload.p);
break;
case MG_EV_POLL: {
if (nc->flags & MG_F_USER_1) {
char msg[100];
static uint32_t prev_send = 0;
uint32_t now = DRV_RTCC_TimeGet();
if (now - prev_send > 1000) {
int len = snprintf(msg, sizeof(msg), "Current RTC value: %u", now);
SYS_PRINT("Publishing message with RTC value=%u\r\n", now);
mg_mqtt_publish(nc, "/stuff", ++msg_id, MG_MQTT_QOS(0), msg, len);
prev_send = now;
}
}
break;
}
case MG_EV_CLOSE:
SYS_PRINT("Connection to broker is closed\r\n");
appData.state = APP_STATE_DONE;
break;
default:
break;
}
}
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
struct mg_mqtt_message *msg = (struct mg_mqtt_message *) p;
(void) nc;
#if 0
if (ev != MG_EV_POLL)
printf("USER HANDLER GOT %d\n", ev);
#endif
switch (ev) {
case MG_EV_CONNECT: {
struct mg_send_mqtt_handshake_opts opts;
memset(&opts, 0, sizeof(opts));
opts.user_name = s_user_name;
opts.password = s_password;
mg_set_protocol_mqtt(nc);
mg_send_mqtt_handshake_opt(nc, "dummy", opts);
break;
}
case MG_EV_MQTT_CONNACK:
if (msg->connack_ret_code != MG_EV_MQTT_CONNACK_ACCEPTED) {
printf("Got mqtt connection error: %d\n", msg->connack_ret_code);
exit(1);
}
s_topic_expr.topic = s_topic;
printf("Subscribing to '%s'\n", s_topic);
mg_mqtt_subscribe(nc, &s_topic_expr, 1, 42);
break;
case MG_EV_MQTT_PUBACK:
printf("Message publishing acknowledged (msg_id: %d)\n", msg->message_id);
break;
case MG_EV_MQTT_SUBACK:
printf("Subscription acknowledged, forwarding to '/test'\n");
break;
case MG_EV_MQTT_PUBLISH: {
#if 0
char hex[1024] = {0};
mg_hexdump(nc->recv_mbuf.buf, msg->payload.len, hex, sizeof(hex));
printf("Got incoming message %.*s:\n%s", (int)msg->topic.len, msg->topic.p, hex);
#else
printf("Got incoming message %.*s: %.*s\n", (int) msg->topic.len,
msg->topic.p, (int) msg->payload.len, msg->payload.p);
#endif
printf("Forwarding to /test\n");
mg_mqtt_publish(nc, "/test", 65, MG_MQTT_QOS(0), msg->payload.p,
msg->payload.len);
break;
}
case MG_EV_CLOSE:
printf("Connection closed\n");
exit(1);
}
}