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Adafruit_MQTT_Library
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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
This commit is contained in:
Brent Rubell 2021-06-22 13:29:11 -04:00 committed by GitHub
parent e524b5f3ae ab78b291b2
commit 3a319ab695
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 38 additions and 7 deletions
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43
Adafruit_MQTT.cpp
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@ -351,13 +351,13 @@ bool Adafruit_MQTT::publish(const char *topic, uint8_t *data, uint16_t bLen,
// If QOS level is high enough verify the response packet.
if (qos > 0) {
len = readFullPacket(buffer, MAXBUFFERSIZE, PUBLISH_TIMEOUT_MS);
len = processPacketsUntil(buffer, MQTT_CTRL_PUBACK, PUBLISH_TIMEOUT_MS);
DEBUG_PRINT(F("Publish QOS1+ reply:\t"));
DEBUG_PRINTBUFFER(buffer, len);
if (len != 4)
return false;
if ((buffer[0] >> 4) != MQTT_CTRL_PUBACK)
return false;
uint16_t packnum = buffer[2];
packnum <<= 8;
packnum |= buffer[3];
@ -508,10 +508,32 @@ void Adafruit_MQTT::processPackets(int16_t timeout) {
}
}
Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
// Check if data is available to read.
uint16_t len =
readFullPacket(buffer, MAXBUFFERSIZE, timeout); // return one full packet
return handleSubscriptionPacket(len);
// Sync or Async subscriber with message
Adafruit_MQTT_Subscribe *s = 0;
// Check if are unread messages
for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
if (subscriptions[i] && subscriptions[i]->new_message) {
s = subscriptions[i];
break;
}
}
// not unread message
if (!s) {
// Check if data is available to read.
uint16_t len = readFullPacket(buffer, MAXBUFFERSIZE,
timeout); // return one full packet
s = handleSubscriptionPacket(len);
}
// it there is a message, mark it as not pending
if (s) {
s->new_message = false;
}
return s;
}
Adafruit_MQTT_Subscribe *Adafruit_MQTT::handleSubscriptionPacket(uint16_t len) {
@ -551,6 +573,12 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::handleSubscriptionPacket(uint16_t len) {
topiclen) == 0) {
DEBUG_PRINT(F("Found sub #"));
DEBUG_PRINTLN(i);
if (subscriptions[i]->new_message) {
DEBUG_PRINTLN(F("Lost previous message"));
} else {
subscriptions[i]->new_message = true;
}
break;
}
}
@ -910,6 +938,7 @@ Adafruit_MQTT_Subscribe::Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver,
callback_double = 0;
callback_io = 0;
io_mqtt = 0;
new_message = false;
}
void Adafruit_MQTT_Subscribe::setCallback(SubscribeCallbackUInt32Type cb) {

2
Adafruit_MQTT.h
View File

@ -320,6 +320,8 @@ public:
AdafruitIO_MQTT *io_mqtt;
bool new_message;
private:
Adafruit_MQTT *mqtt;
};