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Auto-negotiate MQTT version, rather than using a #define. #119

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Auto-negotiate MQTT version, rather than using a #define. #119

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25 changes: 14 additions & 11 deletions Adafruit_MQTT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,7 @@ Adafruit_MQTT::Adafruit_MQTT(const char *server,
will_retain = 0;

packet_id_counter = 0;
mqtt_protocol_level = 4;

}

Expand All @@ -159,7 +160,11 @@ int8_t Adafruit_MQTT::connect() {
// Read connect response packet and verify it
len = readFullPacket(buffer, MAXBUFFERSIZE, CONNECT_TIMEOUT_MS);
if (len != 4)
return -1;
if(mqtt_protocol_level == 4) {
mqtt_protocol_level = 3;
return connect();
} else
return -1;
if ((buffer[0] != (MQTT_CTRL_CONNECTACK << 4)) || (buffer[1] != 2))
return -1;
if (buffer[3] != 0)
Expand All @@ -177,7 +182,7 @@ int8_t Adafruit_MQTT::connect() {
if (!sendPacket(buffer, len))
return -1;

if(MQTT_PROTOCOL_LEVEL < 3) // older versions didn't suback
if(mqtt_protocol_level < 3) // older versions didn't suback
break;

// Check for SUBACK if using MQTT 3.1.1 or higher
Expand Down Expand Up @@ -383,7 +388,7 @@ bool Adafruit_MQTT::unsubscribe(Adafruit_MQTT_Subscribe *sub) {

// if QoS for this subscription is 1 or 2, we need
// to wait for the unsuback to confirm unsubscription
if(subscriptions[i]->qos > 0 && MQTT_PROTOCOL_LEVEL > 3) {
if(subscriptions[i]->qos > 0 && mqtt_protocol_level > 3) {

// wait for UNSUBACK
len = readFullPacket(buffer, MAXBUFFERSIZE, CONNECT_TIMEOUT_MS);
Expand Down Expand Up @@ -504,7 +509,7 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
DEBUG_PRINT(F("Data len: ")); DEBUG_PRINTLN(datalen);
DEBUG_PRINT(F("Data: ")); DEBUG_PRINTLN((char *)subscriptions[i]->lastread);

if ((MQTT_PROTOCOL_LEVEL > 3) &&(buffer[0] & 0x6) == 0x2) {
if ((mqtt_protocol_level > 3) &&(buffer[0] & 0x6) == 0x2) {
uint8_t ackpacket[4];

// Construct and send puback packet.
Expand Down Expand Up @@ -557,15 +562,13 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
p+=2;
// fill in packet[1] last

#if MQTT_PROTOCOL_LEVEL == 3
if(mqtt_protocol_level == 3) {
p = stringprint(p, "MQIsdp");
#elif MQTT_PROTOCOL_LEVEL == 4
} else {
p = stringprint(p, "MQTT");
#else
#error "MQTT level not supported"
#endif
}

p[0] = MQTT_PROTOCOL_LEVEL;
p[0] = mqtt_protocol_level;
p++;

// always clean the session
Expand Down Expand Up @@ -597,7 +600,7 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
p[0] = MQTT_CONN_KEEPALIVE & 0xFF;
p++;

if(MQTT_PROTOCOL_LEVEL == 3) {
if(mqtt_protocol_level == 3) {
p = stringprint(p, clientid, 23); // Limit client ID to first 23 characters.
} else {
if (pgm_read_byte(clientid) != 0) {
Expand Down
4 changes: 1 addition & 3 deletions Adafruit_MQTT.h
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Original file line number Diff line number Diff line change
Expand Up @@ -63,9 +63,6 @@
#define ERROR_PRINTBUFFER(buffer, len) {}
#endif

// Use 3 (MQTT 3.0) or 4 (MQTT 3.1.1)
#define MQTT_PROTOCOL_LEVEL 4

#define MQTT_CTRL_CONNECT 0x1
#define MQTT_CTRL_CONNECTACK 0x2
#define MQTT_CTRL_PUBLISH 0x3
Expand Down Expand Up @@ -235,6 +232,7 @@ class Adafruit_MQTT {
uint8_t will_retain;
uint8_t buffer[MAXBUFFERSIZE]; // one buffer, used for all incoming/outgoing
uint16_t packet_id_counter;
uint8_t mqtt_protocol_level;

private:
Adafruit_MQTT_Subscribe *subscriptions[MAXSUBSCRIPTIONS];
Expand Down