/**
* Connect to MQTT broker.
*
* N.B. None-blocking call.
*/
mqtt_status_t
mqtt_connect(struct mqtt_connection* conn,
const char* host,
uint16_t port,
uint16_t keep_alive)
{
uip_ip6addr_t ip6addr;
uip_ip4addr_t ip4addr;
uip_ipaddr_t *ipaddr;
ipaddr = &ip6addr;
/* Sanity check */
assert(conn != NULL &&
host != NULL);
/* Check if we are already trying to connect */
if(conn->state > MQTT_CONN_STATE_NOT_CONNECTED) {
return MQTT_STATUS_OK;
}
conn->server_host = host;
conn->keep_alive = keep_alive;
conn->server_port = port;
conn->out_buffer_ptr = conn->out_buffer;
conn->out_packet.qos_state = MQTT_QOS_STATE_NO_ACK;
/* First check if the host is an IP address. If not, try to look it up. */
if(uiplib_ip6addrconv(host, &ip6addr) == 0) {
if(uiplib_ip4addrconv(host, &ip4addr) != 0) {
ip64_addr_4to6(&ip4addr, &ip6addr);
} else {
#if UIP_UDP
ipaddr = mdns_lookup(host);
if(ipaddr == NULL) {
printf("MQTT - Resolving host...\r\n");
mdns_query(host);
conn->state = MQTT_CONN_STATE_DNS_LOOKUP;
return MQTT_STATUS_OK;
}
#else /* UIP_UDP */
DBG("Error looking up hostname when mDNS is not used due to UIP_UDP = 0.");
conn->state = MQTT_CONN_STATE_ERROR;
return MQTT_STATUS_DNS_ERROR;
#endif /* UIP_UDP */
}
}
uip_ipaddr_copy(&(conn->server_ip), ipaddr);
/* Initiate the connection if the IP could be resolved. Otherwise the
* connection will be initiated when the DNS lookup is finished, in the main
* event loop.
*/
process_post(&mqtt_process, mqtt_do_connect_tcp_event, conn);
return MQTT_STATUS_OK;
}
/*---------------------------------------------------------------------------*/
static int
start_request(struct http_socket *s)
{
uip_ip4addr_t ip4addr;
uip_ip6addr_t ip6addr;
uip_ip6addr_t *addr;
char host[MAX_HOSTLEN];
char path[MAX_PATHLEN];
uint16_t port;
if(parse_url(s->url, host, &port, path)) {
printf("url %s host %s port %d path %s\n\r",
s->url, host, port, path);
/* First check if the host is an IP address. */
if(uiplib_ip6addrconv(host, &ip6addr) == 0) {
if(uiplib_ip4addrconv(host, &ip4addr) != 0) {
ip64_addr_4to6(&ip4addr, &ip6addr);
} else {
/* Try to lookup the hostname. If it fails, we initiate a hostname
lookup. */
addr = mdns_lookup(host);
if(addr == NULL) {
mdns_query(host);
puts("Resolving host...");
return HTTP_SOCKET_OK;
}
tcp_socket_connect(&s->s, addr, port);
return HTTP_SOCKET_OK;
}
}
tcp_socket_connect(&s->s, &ip6addr, port);
return HTTP_SOCKET_OK;
} else {
return HTTP_SOCKET_ERR;
}
}
/*-----------------------------------------------------------------------------------*/
void
websocket_http_client_appcall(void *state)
{
char *dataptr;
struct websocket_http_client_state *s = state;
if(uip_connected()) {
s->timer = 0;
s->outputbufptr = 0;
s->outputbuf_sendnext = 0;
s->state = WEBSOCKET_HTTP_CLIENT_STATE_STATUSLINE;
senddata(s);
return;
}
if(uip_timedout()) {
websocket_http_client_timedout(s);
}
if(uip_aborted()) {
/* printf("aborted\n"); */
websocket_http_client_aborted(s);
}
if(state == NULL) {
uip_abort();
return;
}
if(s->state == WEBSOCKET_HTTP_CLIENT_STATE_CLOSE) {
websocket_http_client_closed(s);
uip_abort();
return;
}
/* The acked() and newdata() functions may alter the uip_appdata
ptr, so we need to store it in the "dataptr" variable so that we
can restore it before the senddata() function is called. */
dataptr = uip_appdata;
if(uip_acked()) {
s->timer = 0;
acked(s);
}
if(uip_newdata()) {
s->timer = 0;
newdata(s);
}
uip_appdata = dataptr;
if(uip_rexmit() ||
uip_newdata() ||
uip_acked()) {
senddata(s);
} else if(uip_poll()) {
senddata(s);
++s->timer;
if(s->timer == WEBSOCKET_HTTP_CLIENT_TIMEOUT) {
websocket_http_client_timedout(s);
uip_abort();
return;
}
}
if(uip_closed()) {
tcp_markconn(uip_conn, NULL);
if(s->httpflag != HTTPFLAG_MOVED) {
/* Send NULL data to signal EOF. */
websocket_http_client_datahandler(s, NULL, 0);
} else {
#if UIP_UDP
if(mdns_lookup(s->host) == NULL) {
mdns_query(s->host);
}
#endif /* UIP_UDP */
websocket_http_client_get(s, s->host, s->port, s->file,
s->subprotocol);
}
}
}