97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
#include <TinyMqtt.h> // https://github.com/hsaturn/TinyMqtt
|
|
|
|
/**
|
|
*
|
|
* +-----------------------------+
|
|
* | ESP |
|
|
* | +--------+ | 1883 <--- External client/s
|
|
* | +-------->| broker | | 1883 <--- External client/s
|
|
* | | +--------+ |
|
|
* | | ^ |
|
|
* | | | |
|
|
* | v v |
|
|
* | +----------+ +----------+ |
|
|
* | | internal | | internal | |
|
|
* | | client | | client | |
|
|
* | +----------+ +----------+ |
|
|
* | |
|
|
* +-----------------------------+
|
|
*
|
|
* pros - Reduces internal latency (when publish is received by the same ESP)
|
|
* - Reduces wifi traffic
|
|
* - No need to have an external broker
|
|
* - can still report to a 'main' broker (TODO see documentation that have to be written)
|
|
* - accepts external clients
|
|
*
|
|
* cons - Takes more memory
|
|
* - a bit hard to understand
|
|
*
|
|
*/
|
|
|
|
#include <my_credentials.h>
|
|
|
|
std::string topic="sensor/temperature";
|
|
|
|
MqttBroker broker(1883);
|
|
|
|
MqttClient mqtt_a(&broker);
|
|
MqttClient mqtt_b(&broker);
|
|
|
|
void onPublishA(const MqttClient* source, const Topic& topic, const char* payload, size_t length)
|
|
{ Serial << endl << "---------> A Received " << topic.c_str() << endl; }
|
|
|
|
void onPublishB(const MqttClient* source, const Topic& topic, const char* payload, size_t length)
|
|
{ Serial << endl << "---------> B Received " << topic.c_str() << endl; }
|
|
|
|
void setup()
|
|
{
|
|
Serial.begin(115200);
|
|
delay(500);
|
|
Serial << "Clients with wifi " << endl;
|
|
|
|
WiFi.mode(WIFI_STA);
|
|
WiFi.begin(ssid, password);
|
|
|
|
while (WiFi.status() != WL_CONNECTED) { Serial << '-'; delay(500); }
|
|
|
|
Serial << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;
|
|
|
|
broker.begin();
|
|
|
|
mqtt_a.setCallback(onPublishA);
|
|
mqtt_a.subscribe(topic);
|
|
|
|
mqtt_b.setCallback(onPublishB);
|
|
mqtt_b.subscribe(topic);
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
broker.loop(); // Don't forget to add loop for every broker and clients
|
|
|
|
mqtt_a.loop();
|
|
mqtt_b.loop();
|
|
|
|
// ============= client A publish ================
|
|
static const int intervalA = 5000; // publishes every 5s
|
|
static uint32_t timerA = millis() + intervalA;
|
|
|
|
if (millis() > timerA)
|
|
{
|
|
Serial << "A is publishing " << topic.c_str() << endl;
|
|
timerA += intervalA;
|
|
mqtt_a.publish(topic);
|
|
}
|
|
|
|
// ============= client B publish ================
|
|
static const int intervalB = 7000; // will send topic each 7s
|
|
static uint32_t timerB = millis() + intervalB;
|
|
|
|
if (millis() > timerB)
|
|
{
|
|
Serial << "B is publishing " << topic.c_str() << endl;
|
|
timerB += intervalB;
|
|
mqtt_b.publish(topic, std::string(String(15+millis()%10).c_str()));
|
|
}
|
|
}
|