JJRC-H61

How to run app

1. Install Expo as global package (npm i -g expo expo-cli)
2. Install React-native as global package (npm i -g react-native-cli)
3. Install other packages (npm i)
4. Link UDP native dependency (react-native link react-native-udp)
5. Run app using ExpoCLI (expo start --lan)
6. Install Expo app on your phone
7. Run Expo and scan QRCode

TODO

• check WiFi name - drones network has specific name
• check Bluetooth device name - Xbox pad has specific name
• add Xbox pad key schema presentation
• add Xbox pad configuration

Tips

UDP checksum

There was used very simple algorithm for most commands. I need subtract all bytes from each other. Example:

	const _ = messageWithoutChecksum = Buffer.from('ff087e3f403f90121200', 'hex');
	const checksum = Buffer.from([ _[0] - _[1] - _[2] - _[3] - _[4] - _[5] - _[6] - _[7] - _[8] - _[9] ])[0];
	// checksum === 0x07

I found only 2 exceptions to this relationship:

• calibration command (ff087e3f403fd0121200cb)
• stop command (ff087e3f403f901212a069)