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esp32.ino
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esp32.ino
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#include <Wire.h>
#include <WiFi.h>
#include "esp_wpa2.h"
#include <ThingsBoard.h>
// Pins for I2C data transfer and clock.
#define NUCLEO 9
#define I2C_SDA 21
#define I2C_SCL 22
// WiFi credentials
#define SSID ""
#define PASSWORD ""
// ThingsBoard credentials
#define SERVER "demo.thingsboard.io"
#define TOKEN ""
// Helper macro to calculate array size
#define COUNT_OF(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))
// Initialise WiFi, PubSub (MQTT) and ThingsBoard clients.
WiFiClient wifi;
PubSubClient client(wifi);
ThingsBoard tb(wifi);
int loop_delay = 1; // ms of delay for loop function.
// Initialise current variables and target defaults.
double current_temp, current_ph, target_temp = 30, target_ph = 5;
int current_rpm, target_rpm = 1250;
// Size for I2C byte array.
const int size = sizeof(double)*2 + sizeof(int);
void packData(byte* data, double t, double p, int r) {
memcpy(data, &t, sizeof(double));
memcpy(data + sizeof(double), &p, sizeof(double));
memcpy(data + sizeof(double)*2, &r, sizeof(int));
}
void unpackData(byte* data, double* t, double* p, int* r) {
memcpy(t, data, sizeof(double));
memcpy(p, data + sizeof(double), sizeof(double));
memcpy(r, data + sizeof(double)*2, sizeof(int));
}
void connect() {
Serial.print("Connecting to network: "); Serial.println(SSID);
// Connext to the WiFi network.
WiFi.begin(SSID, PASSWORD);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// WiFi is now connected.
Serial.println("WiFi connected.");
Serial.print("IP address: "); Serial.println(WiFi.localIP());
}
// Responses to ThingsBoard RPC requests.
RPC_Response processTemperatureChange(const RPC_Data &data) {
target_temp = data;
Serial.println("--- TEMP CHANGE ---");
Serial.print("Temperature: ");
Serial.println(target_temp);
Serial.println("-------------------");
return RPC_Response();
}
RPC_Response processPhChange(const RPC_Data &data) {
target_ph = data;
Serial.println("--- PH CHANGE ---");
Serial.print("pH: ");
Serial.println(target_ph);
Serial.println("-----------------");
return RPC_Response();
}
RPC_Response processRpmChange(const RPC_Data &data) {
target_rpm = data;
Serial.println("--- RPM CHANGE ---");
Serial.print("RPM : ");
Serial.println(target_rpm);
Serial.println("------------------");
return RPC_Response();
}
// RPC handlers
const size_t callbacks_size = 3;
RPC_Callback callbacks[callbacks_size] = {
{ "setTemperature", processTemperatureChange },
{ "setpH", processPhChange },
{ "setRPM", processRpmChange }
};
void setup() {
// Initialise Wire transmission.
Wire.begin(I2C_SDA, I2C_SCL);
// Initialise WiFi.
connect();
// Initialise Serial transmission.
Serial.begin(115200);
Serial.println("Setup complete.");
}
void loop() {
long now = millis();
// Reconnect to WiFi, if needed.
if (WiFi.status() != WL_CONNECTED) {
connect();
}
// Reconnect to ThingsBoard, if needed.
if (!tb.connected()) {
bool connected = false, subscribed = false;
// Connect to ThingsBoard.
Serial.print("Connecting to: "); Serial.print(SERVER); Serial.print(" with token: "); Serial.println(TOKEN);
while (!connected) {
connected = tb.connect(SERVER, TOKEN);
if (!connected) {
Serial.println("Failed to connect to ThingsBoard.");
delay(500);
}
}
// Resubscribe to RPC events.
Serial.println("Subscribing to RPC events ...");
while(!subscribed) {
subscribed = tb.RPC_Subscribe(callbacks, COUNT_OF(callbacks));
if (!subscribed) {
Serial.println("Failed to subscribe to RPC events.");
delay(500);
}
}
Serial.println("Subscribed to RPC events.");
}
// Send the target values from ThingsBoard to the Nucleo.
byte data[size];
packData(data, target_temp, target_ph, target_rpm);
Wire.beginTransmission(NUCLEO);
Wire.write(data, size);
Wire.endTransmission();
// Wait before requesting the current values from the Nucleo.
// This ensure that the wire buffer is emptied before we request.
delay(10);
// Request the current values from the Nucleo.
Wire.requestFrom(NUCLEO, size);
if (Wire.available()) {
byte data[size];
int i=0;
while (Wire.available() && i<size) {
data[i] = Wire.read();
i++;
}
unpackData(data, ¤t_temp, ¤t_ph, ¤t_rpm);
// Log the data.
Serial.print("Received payload: "); Serial.println("{"); Serial.print(" \"Temperature\": "); Serial.print(current_temp); Serial.println(","); Serial.print(" \"pH\": "); Serial.print(current_ph); Serial.println(","); Serial.print(" \"RPM\": "); Serial.println(current_rpm); Serial.println("}");
// Send data to Thingsboard.
tb.sendTelemetryFloat("Temperature", current_temp);
tb.sendTelemetryFloat("pH", current_ph);
tb.sendTelemetryFloat("RPM", current_rpm);
}
// Process messages
tb.loop();
delay(loop_delay);
}