how to write iot code

Choose Hardware/Platform: Select a microcontroller (e.g., ESP8266, Arduino) or IoT platform (e.g., Raspberry Pi, AWS IoT).

Set Up Connectivity: Use Wi-Fi, Bluetooth, or cellular modules (e.g., AT commands for SIM800L).

Write Firmware: Code in C/C++ (Arduino), Python (RPi), or JavaScript (Node.js). Example Arduino snippet:
 
#include
void setup() {
Serial.begin(9600);
WiFi.begin(“SSID”, “password”);
while (WiFi.status() != WL_CONNECTED) { delay(500); }
}
void loop() { /* Sensor readings */ }
 

Data Handling: Use MQTT/HTTP to send data to cloud services (e.g., AWS IoT, Firebase). Example MQTT publish:
 
import paho.mqtt.publish as publish
publish.single(“topic”, “payload”, hostname=”mqtt.eclipse.org”)
 

Security: Encrypt data (TLS/SSL) and use secure protocols (MQTT over TLS).

Cloud Integration: Process data with serverless functions (e.g., AWS Lambda) or databases (e.g., MongoDB).

Actuators/Outputs: Control devices via APIs (e.g., REST) or GPIO pins.

Tools: PlatformIO, Arduino IDE, MicroPython.
Libraries: PubSubClient (MQTT), Blynk (mobile integration).

Keep code modular, handle errors, and optimize power usage for scalability.