Merge pull request #195 from rgorosito/fix-loss-subscriptions
Fix: Subscriptions can't be read if arrive when waiting for response of ping or publish
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commit
3a319ab695
@ -351,13 +351,13 @@ bool Adafruit_MQTT::publish(const char *topic, uint8_t *data, uint16_t bLen,
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// If QOS level is high enough verify the response packet.
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if (qos > 0) {
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len = readFullPacket(buffer, MAXBUFFERSIZE, PUBLISH_TIMEOUT_MS);
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len = processPacketsUntil(buffer, MQTT_CTRL_PUBACK, PUBLISH_TIMEOUT_MS);
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DEBUG_PRINT(F("Publish QOS1+ reply:\t"));
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DEBUG_PRINTBUFFER(buffer, len);
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if (len != 4)
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return false;
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if ((buffer[0] >> 4) != MQTT_CTRL_PUBACK)
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return false;
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uint16_t packnum = buffer[2];
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packnum <<= 8;
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packnum |= buffer[3];
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@ -508,10 +508,32 @@ void Adafruit_MQTT::processPackets(int16_t timeout) {
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}
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}
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Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
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// Check if data is available to read.
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uint16_t len =
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readFullPacket(buffer, MAXBUFFERSIZE, timeout); // return one full packet
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return handleSubscriptionPacket(len);
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// Sync or Async subscriber with message
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Adafruit_MQTT_Subscribe *s = 0;
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// Check if are unread messages
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for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
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if (subscriptions[i] && subscriptions[i]->new_message) {
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s = subscriptions[i];
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break;
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}
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}
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// not unread message
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if (!s) {
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// Check if data is available to read.
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uint16_t len = readFullPacket(buffer, MAXBUFFERSIZE,
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timeout); // return one full packet
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s = handleSubscriptionPacket(len);
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}
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// it there is a message, mark it as not pending
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if (s) {
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s->new_message = false;
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}
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return s;
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}
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Adafruit_MQTT_Subscribe *Adafruit_MQTT::handleSubscriptionPacket(uint16_t len) {
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@ -551,6 +573,12 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::handleSubscriptionPacket(uint16_t len) {
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topiclen) == 0) {
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DEBUG_PRINT(F("Found sub #"));
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DEBUG_PRINTLN(i);
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if (subscriptions[i]->new_message) {
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DEBUG_PRINTLN(F("Lost previous message"));
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} else {
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subscriptions[i]->new_message = true;
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}
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break;
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}
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}
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@ -910,6 +938,7 @@ Adafruit_MQTT_Subscribe::Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver,
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callback_double = 0;
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callback_io = 0;
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io_mqtt = 0;
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new_message = false;
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}
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void Adafruit_MQTT_Subscribe::setCallback(SubscribeCallbackUInt32Type cb) {
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@ -320,6 +320,8 @@ public:
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AdafruitIO_MQTT *io_mqtt;
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bool new_message;
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private:
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Adafruit_MQTT *mqtt;
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};
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