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isRetained() and deleteTopic() methods are added #924

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isRetained() and deleteTopic() methods are added #924

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a0a1d5c
added isRetained() to identify Retained flag in Callback
anklimov Feb 13, 2022
665b552
deleteTopic method added
anklimov Feb 13, 2022
6a89cc4
deleteTopic method added (fix)
anklimov Feb 13, 2022
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12 changes: 12 additions & 0 deletions src/PubSubClient.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -445,6 +445,18 @@ boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigne
return publish(topic, payload, plength, false);
}

boolean PubSubClient::deleteTopic(const char* topic) {
uint8_t buf[64];
if (!connected()) return false;
uint8_t len = strlen(topic);
buf[0]=0x31; //PUBLISH, QoS=0, Retained
buf[1]=len+2; //Packet len = topic + his Length
buf[2]=0;
buf[3]=len; //topic StrLen
strncpy((char*)buf+4,topic,sizeof(buf)-5);
return write( buf,len+4);
}

boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigned int plength, boolean retained) {
if (connected()) {
if (this->bufferSize < MQTT_MAX_HEADER_SIZE + 2+strnlen(topic, this->bufferSize) + plength) {
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2 changes: 2 additions & 0 deletions src/PubSubClient.h
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Expand Up @@ -149,11 +149,13 @@ class PubSubClient : public Print {
boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage, boolean cleanSession);
void disconnect();
boolean publish(const char* topic, const char* payload);
boolean deleteTopic(const char* topic);
boolean publish(const char* topic, const char* payload, boolean retained);
boolean publish(const char* topic, const uint8_t * payload, unsigned int plength);
boolean publish(const char* topic, const uint8_t * payload, unsigned int plength, boolean retained);
boolean publish_P(const char* topic, const char* payload, boolean retained);
boolean publish_P(const char* topic, const uint8_t * payload, unsigned int plength, boolean retained);
boolean isRetained() {return this->buffer[0]&0x1;}
// Start to publish a message.
// This API:
// beginPublish(...)
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