require 'uart'

UART.open '/dev/tty.usbserial-00000000' do |serial|
  str = 'Hello World!'
  serial.write [0x8A, 0xA8, 0x00, 0x00, str.bytesize].pack 'C5'
  serial.write str.b
  p serial.read(4).unpack('C4').map { |x| x.to_s(16) }
end

require 'uart'

a = UART.open('/dev/ttyAMA0') { |s| s.write("\xFF\x01\x86\x00\x00\x00\x00\x00\x79"); s.read(9).unpack('C9')}
{ temp: a[4] - 40, co2: a[2] * 256 + a[3] } if 256 - a[1..7].reduce(&:+)%256 == a[8]

require 'uart'
require 'io/wait'

class Sample < Struct.new(:time,
                          :pm1_0_standard, :pm2_5_standard, :pm10_standard,
                          :pm1_0_env,      :pm2_5_env,
                          :concentration_unit,
                          :particle_03um,   :particle_05um,   :particle_10um,
                          :particle_25um,   :particle_50um,   :particle_100um)
end

uart = UART.open ARGV[0], 9600, '8N1'

p Sample.members # header

loop do
  uart.wait_readable
  start1, start2 = uart.read(2).bytes

  # According to the data sheet, packets always start with 0x42 and 0x4d
  unless start1 == 0x42 && start2 == 0x4d
    # skip a sample
    uart.read
    next
  end

  length = uart.read(2).unpack('n').first
  data = uart.read(length)
  crc  = 0x42 + 0x4d + 28 + data.bytes.first(26).inject(:+)
  data = data.unpack('n14')

  next unless crc == data.last # crc failure

  p Sample.new(Time.now.utc, *data.first(12)).to_a
end

require 'uart'

# find your flipper zero device handle: https://docs.flipper.net/development/cli#rnDLl
fname = ARGV.shift # provide the path to your flipper zero
raise "Please specify a device to open" if fname.nil?
raise "Couldn't find #{fname}" unless File.exist?(fname)

# open the flipper and specify the correct baud
UART.open fname, 115200 do |flipper|
    # read & print the Flipper Zero terminal art
    puts flipper.read

    # input command, or "help" if no command is supplied
    message = ARGV.join(" ") || "help"
    flipper.write "#{message}\r\n" # flipper cli uses \r\n to terminate lines.
    # read & print message output
    puts flipper.read
end