89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include "TinyMqtt.h" // https://github.com/hsaturn/TinyMqtt
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#include "TinyStreaming.h" // https://github.com/hsaturn/TinyConsole
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/** Simple Client (The simplest configuration)
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*
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*
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* +--------+
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* +------>| broker |<--- < Other client
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* | +--------+
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* |
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* +-----------------+
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* | ESP | |
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* | +----------+ |
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* | | internal | |
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* | | client | |
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* | +----------+ |
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* | |
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* +-----------------+
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*
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* 1 - change the ssid/password
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* 2 - change BROKER values (or keep emqx.io test broker)
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* 3 - you can use mqtt-spy to connect to the same broker and
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* see the sensor/temperature updated by the client.
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*
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* pro - small memory footprint (both ram and flash)
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* - very simple to setup and use
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*
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* cons - cannot work without wifi connection
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* - stop working if broker is down
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* - local publishes takes more time (because they go outside)
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*/
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const char* BROKER = "broker.emqx.io";
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const uint16_t BROKER_PORT = 1883;
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const char* ssid = "";
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const char* password = "";
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static float temp=19;
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static MqttClient client;
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void setup()
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{
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Serial.begin(115200);
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delay(500);
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Serial << "Simple clients with wifi " << endl;
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if (strlen(ssid)==0)
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Serial << "****** PLEASE MODIFY ssid/password *************" << endl;
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WiFi.mode(WIFI_STA);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED)
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{ delay(500); Serial << '.'; }
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Serial << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;
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client.connect(BROKER, BROKER_PORT);
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}
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void loop()
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{
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client.loop(); // Don't forget to call loop() for each broker and client
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// delay(1000); please avoid usage of delay (see below how this done using next_send and millis())
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static auto next_send = millis();
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if (millis() > next_send)
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{
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next_send += 1000;
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if (not client.connected())
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{
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Serial << millis() << ": Not connected to broker" << endl;
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return;
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}
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auto rnd=random(100);
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if (rnd > 66) temp += 0.1;
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else if (rnd < 33) temp -= 0.1;
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Serial << "--> Publishing a new sensor/temperature value: " << temp << endl;
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client.publish("sensor/temperature", String(temp));
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}
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}
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