This Flutter app provides a user-friendly interface for transmitting SAME (Specific Area Message Encoding) alerts and simple FM tones using a HackRF device.

⚠️ Important Requirements:

• A HackRF device must be connected before launching the app.
• In Addition USB OTG must be enabled.
• Without a HackRF connected, the app will not initialize properly.

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• Plug in your HackRF using a USB OTG adapter.
• Ensure it is recognized by the system before launching the app.

When the app starts:

• It will attempt to initialize the HackRF.
• Status messages are displayed in the Status card at the top.
• If successful, you will see:
  Ready.

If initialization fails, an error message will be displayed.

• Shows current state:
  • Not Initialized
  • Initializing...
  • Ready. Plug in HackRF.
  • Transmitting SAME burst...
  • Transmitting 1kHz Tone...
  • Stopped. Ready to transmit.
  • Error: with details

• WX Frequency (MHz): Choose from NOAA Weather frequencies (162.400–162.550 MHz).
• TX VGA Gain: Adjust transmit gain (0–47 dB) with a slider.

Configure your SAME message parameters:

• Event Code: Tap the card to open a searchable list of SAME/EAS event codes (e.g., RWT – Required Weekly Test).
• FIPS Code: 6-digit code for the target area (e.g., 039007).
• Originator: Select from:
  • WXR (Weather Service)
  • EAS (Emergency Alert System)
  • CIV (Civil Authority)

• Expiration (Purge Time): Choose how long the alert remains valid (15 minutes → 6 hours).
• Station ID: Identifier of the transmitting station (e.g., KCLE-NWR).

At the bottom of the screen:

• Transmit SAME Alert: Sends a SAME burst with your configured parameters.
  • Runs once and stops automatically when complete.
• Transmit Tone: Sends a continuous 1 kHz audio tone on the selected frequency.
• Stop: Immediately halts any ongoing transmission.

1. Connect HackRF with OTG enabled.
2. Launch the app → Wait for Ready. Plug in HackRF.
3. Choose 162.550 MHz and set TX VGA Gain.
4. Configure:
   • Event: RWT – Required Weekly Test
   • FIPS: 039007
   • Originator: WXR
   • Expiration: 30 Mins
   • Station ID: KCLE-NWR
5. Press Transmit SAME Alert.
6. Observe status change to Transmission Complete.

• SAME bursts are one-shot transmissions — they end automatically.
• Tone transmissions continue until manually stopped.
• Always comply with your radio license and regulatory requirements when transmitting.