import machine
import time
import json          # The most important library for this module
import dht


# --- Configuration ----
DEVICE_ID = "PICO_W_BLDG_01"
LOCATION  = "Server_Room"

# --- DHT22 Setup ---
# DHT22 DATA pin connected to GP15
sensor = dht.DHT22(machine.Pin(16))

print("Experiment 4.1: JSON Packaging Started (DHT22)...")
print("-" * 40)

while True:
    try:
        # 1. SENSE: Get Raw Data from DHT22
        sensor.measure()
        temperature = sensor.temperature()
        humidity = sensor.humidity()

        # 2. STRUCTURE: Create a Python Dictionary (Schema)
        data_dictionary = {
            "sensor_id": DEVICE_ID,
            "location": LOCATION,
            "telemetry": {
                "temp": round(temperature, 2),
                "humidity": round(humidity, 2),
                "unit": "Celsius"
            },
            "timestamp_ms": time.ticks_ms(),  # Relative time since boot
            "status": "OK"
        }

        # 3. TRANSLATE: Serialize to JSON String
        json_packet = json.dumps(data_dictionary)

        # 4. OUTPUT: Send to Console / Serial
        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)