import machine
import time
import json
import dht

DEVICE_ID = "VARSHITHA_17"
LOCATION = "Server_Room"

# Initialize DHT22 on Pin 16
sensor = dht.DHT22(machine.Pin(16))

print("experiment 4.1: JSON packaging Started (DHT22)...")
print("-" * 40)

while True:
    try:
        sensor.measure()
        temperature = sensor.temperature()
        humidity = sensor.humidity()

        # FIXED: Changed 'data.dictionary' to 'data_dictionary'
        data_dictionary = {
            "sensor_id": DEVICE_ID,
            "location": LOCATION,
            "telemetry": {
                "temp": round(temperature, 2),
                "humidity": round(humidity, 2),
                "unit": "celsius"
            },
            "timestamp_ms": time.ticks_ms(),
            "status": "OK"
        }

        # Convert dictionary to a JSON string
        json_packet = json.dumps(data_dictionary)

        # FIXED: Used lowercase 'json_packet' to match definition
        print(f"RAW DICTIONARY : {data_dictionary}")
        print(f"JSON PACKET    : {json_packet}")
        print(f"DATA TYPE      : {type(json_packet)}")

    except OSError:
        print("sensor read error")

    print("-" * 40)
    time.sleep(5)