int8_t Adafruit_MQTT::connect() {
// Connect to the server.
if (!connectServer())
return -1;
// Construct and send connect packet.
uint8_t len = connectPacket(buffer);
if (!sendPacket(buffer, len))
return -1;
// Read connect response packet and verify it
len = readPacket(buffer, 4, CONNECT_TIMEOUT_MS);
if (len != 4)
return -1;
if ((buffer[0] != (MQTT_CTRL_CONNECTACK << 4)) || (buffer[1] != 2))
return -1;
if (buffer[3] != 0)
return buffer[3];
// Setup subscriptions once connected.
for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
// Ignore subscriptions that aren't defined.
if (subscriptions[i] == 0) continue;
// Construct and send subscription packet.
uint8_t len = subscribePacket(buffer, subscriptions[i]->topic, subscriptions[i]->qos);
if (!sendPacket(buffer, len))
return -1;
// Check for SUBACK if using MQTT 3.1.1 or higher
// TODO: The Server is permitted to start sending PUBLISH packets matching the
// Subscription before the Server sends the SUBACK Packet.
// if(MQTT_PROTOCOL_LEVEL > 3) {
// len = readPacket(buffer, 5, CONNECT_TIMEOUT_MS);
// DEBUG_PRINT(F("SUBACK:\t"));
// DEBUG_PRINTBUFFER(buffer, len);
// if ((len != 5) || (buffer[0] != (MQTT_CTRL_SUBACK << 4))) {
// return 6; // failure to subscribe
// }
// }
}
return 0;
}
int8_t Adafruit_MQTT::connect() {
// Connect to the server.
if (!connectServer())
return -1;
// Construct and send connect packet.
uint8_t len = connectPacket(buffer);
if (!sendPacket(buffer, len))
return -1;
// Read connect response packet and verify it
len = readPacket(buffer, 4, CONNECT_TIMEOUT_MS);
if (len != 4)
return -1;
if ((buffer[0] != (MQTT_CTRL_CONNECTACK << 4)))
return -1;
if (buffer[3] != 0)
return buffer[3];
// Setup subscriptions once connected.
for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
// Ignore subscriptions that aren't defined.
if (subscriptions[i] == 0) continue;
// Construct and send subscription packet.
uint8_t len = subscribePacket(buffer, subscriptions[i]->topic, subscriptions[i]->qos);
if (!sendPacket(buffer, len))
return -1;
// Get SUBACK
len = readPacket(buffer, 5, CONNECT_TIMEOUT_MS);
// DEBUG_PRINT(F("SUBACK:\t"));
// DEBUG_PRINTBUFFER(buffer, len);
// if (false) {
// return 6; // failure to subscribe
// }
}
return 0;
}
