Code:
/*
* Made by KinCony IoT: https://www.kincony.com
*
* This Arduino program implements communication between ESP32 and the Tuya module
* via UART (serial communication). It listens for specific packets from the Tuya module
* and responds according to the predefined commands.
*
* Functionality:
* 1. When the ESP32 receives a heartbeat packet (55 AA 00 00 00 00 FF),
* it sends a heartbeat response (55 AA 03 00 00 01 00 03).
* 2. When the ESP32 receives a product information request (55 AA 00 01 00 00 00),
* it sends a product information response (55 AA 03 01 ...).
* 3. When the ESP32 receives a work mode request (55 AA 00 02 00 00 01),
* it sends a work mode response (55 AA 03 02 00 03 10 1C 14 47).
* 4. When the ESP32 receives a network status request (55 AA 00 03 00 01 00 03),
* it sends a network status response (55 AA 03 03 00 00 05).
* 5. Subsequent heartbeat packets (55 AA 00 00 00 00 FF) are responded to with
* (55 AA 03 00 00 01 01 04).
*/
#include <HardwareSerial.h>
// Create a HardwareSerial object for UART communication on ESP32
HardwareSerial tuyaSerial(1);
// Define the GPIO pins for TXD and RXD used for serial communication
#define TXD_PIN 16
#define RXD_PIN 17
// Set the baud rate for Tuya module communication to 9600
#define BAUD_RATE 9600
// Define the response packets for different commands from the Tuya module
// Heartbeat response: 55 AA 03 00 00 01 00 03
uint8_t heartBeatResponse[] = {0x55, 0xAA, 0x03, 0x00, 0x00, 0x01, 0x00, 0x03};
// Product info response with a detailed payload (e.g., firmware version, product name, etc.)
uint8_t productInfoResponse[] = {
0x55, 0xAA, 0x03, 0x01, 0x00, 0x2A, 0x7B, 0x22, 0x70, 0x22, 0x3A, 0x22,
0x63, 0x68, 0x6D, 0x7A, 0x6C, 0x67, 0x6A, 0x70, 0x61, 0x64, 0x70, 0x71,
0x78, 0x64, 0x6B, 0x6F, 0x22, 0x2C, 0x22, 0x76, 0x22, 0x3A, 0x22, 0x31,
0x2E, 0x30, 0x2E, 0x30, 0x22, 0x2C, 0x22, 0x6D, 0x22, 0x3A, 0x30, 0x7D, 0xAA
};
// Work mode response: 55 AA 03 02 00 03 10 1C 14 47
uint8_t workModeResponse[] = {0x55, 0xAA, 0x03, 0x02, 0x00, 0x03, 0x10, 0x1C, 0x14, 0x47};
// Network status response: 55 AA 03 03 00 00 05
uint8_t netStatusResponse[] = {0x55, 0xAA, 0x03, 0x03, 0x00, 0x00, 0x05};
// Subsequent heartbeat response: 55 AA 03 00 00 01 01 04
uint8_t secondHeartBeatResponse[] = {0x55, 0xAA, 0x03, 0x00, 0x00, 0x01, 0x01, 0x04};
void setup() {
// Initialize the serial communication for debugging at 115200 baud rate
Serial.begin(115200);
// Initialize the serial communication with Tuya module at 9600 baud rate
tuyaSerial.begin(BAUD_RATE, SERIAL_8N1, RXD_PIN, TXD_PIN);
// Debug message to indicate that the serial communication has been initialized
Serial.println("ESP32-Tuya serial communication initialized.");
}
void loop() {
// Check if data is available from the Tuya module
if (tuyaSerial.available()) {
uint8_t incomingPacket[7]; // Array to store the received packet
size_t bytesRead = tuyaSerial.readBytes(incomingPacket, 7); // Read 7 bytes from Tuya
// Check if the packet has a valid header (0x55, 0xAA)
if (bytesRead >= 2 && incomingPacket[0] == 0x55 && incomingPacket[1] == 0xAA) {
// If less than 7 bytes were received, wait for more data
if (bytesRead < 7) {
Serial.println("Incomplete packet received. Waiting for remaining bytes...");
delay(50); // Delay to allow more data to be received
while (tuyaSerial.available()) {
incomingPacket[bytesRead++] = tuyaSerial.read(); // Continue reading remaining bytes
if (bytesRead >= 7) break;
}
}
// If still less than 7 bytes, discard the incomplete packet
if (bytesRead < 7) {
Serial.println("Error: Incomplete packet discarded.");
return;
}
// Debug: Print the received packet for logging
Serial.print("Received packet: ");
for (size_t i = 0; i < 7; i++) {
Serial.print(incomingPacket[i], HEX);
Serial.print(" ");
}
Serial.println();
// Call the function to process the received packet
processTuyaPacket(incomingPacket, 7);
} else {
// If the header is invalid, discard the packet and flush the buffer
Serial.print("Error: Invalid packet header. Data received: ");
for (size_t i = 0; i < bytesRead; i++) {
Serial.print(incomingPacket[i], HEX);
Serial.print(" ");
}
Serial.println();
tuyaSerial.flush(); // Clear the serial buffer
}
}
// Delay to avoid CPU overuse
delay(100);
}
// Function to process the received packet and send the appropriate response
void processTuyaPacket(uint8_t* packet, size_t size) {
// Ensure the packet size is 7 and the header is valid
if (size == 7 && packet[0] == 0x55 && packet[1] == 0xAA) {
// Determine the command in the packet (packet[2])
switch(packet[2]) {
case 0x00:
if (packet[3] == 0x00 && packet[4] == 0x00 && packet[5] == 0x00 && packet[6] == 0xFF) {
Serial.println("Heartbeat received.");
sendPacket(heartBeatResponse, sizeof(heartBeatResponse));
} else if (packet[3] == 0x01 && packet[4] == 0x00 && packet[5] == 0x00 && packet[6] == 0x00) {
Serial.println("Product info request received.");
sendPacket(productInfoResponse, sizeof(productInfoResponse));
} else if (packet[3] == 0x02 && packet[4] == 0x00 && packet[5] == 0x00 && packet[6] == 0x01) {
Serial.println("Work mode request received.");
sendPacket(workModeResponse, sizeof(workModeResponse));
} else if (packet[3] == 0x03 && packet[4] == 0x00 && packet[5] == 0x01 && packet[6] == 0x00) {
Serial.println("Network status request received.");
sendPacket(netStatusResponse, sizeof(netStatusResponse));
}
break;
default:
Serial.println("Error: Unhandled command received.");
break;
}
}
}
// Function to send the response packet to the Tuya module
void sendPacket(uint8_t* packet, size_t size) {
// Send the packet via UART to Tuya module
tuyaSerial.write(packet, size);
// Debug: Print the sent packet for logging
Serial.print("Sent packet: ");
for (size_t i = 0; i < size; i++) {
Serial.print(packet[i], HEX);
Serial.print(" ");
}
Serial.println();
}
Kilcony RS-485 SHT30 Sensor - Setting MODBUS Address
