Craft a HCI_Enhanced_Setup_Synchronous_Connection command to decrease the eSCO call connection

esco.rb

ogf = '0x01' # Opcode Group Field
ocf = '0x003d' # Opcode Command Field

# Change this according to the handle
handle = 266

def binary(data)
  data[2..-1].split("").each_slice(2).map { |i| "#{i.join}" }.reverse
end

def calculate_handle(handle)
  hex_handle = handle.to_s(16)
  diff = 4 - hex_handle.length
  "0x#{"0" * diff}#{hex_handle}"
end

args = [
  calculate_handle(handle),
  '0x00001F40', # tx_bandwidth
  '0x00001F40', # rx_bandwidth
  '0x0000000005', # tx_coding_format
  '0x0000000005', # rx_coding_format
  '0x003C', # tx_codec_frame
  '0x003C', # rx_codec_frame
  '0x00007D00', # input_bandwidth
  '0x00007D00', # output_bandwidth
  '0x0000000004', # input_coding_format
  '0x0000000004', # output_coding_format
  '0x0010', # input_codec_size
  '0x0010', # output_codec_size
  '0x02', # input_pcm_format
  '0x02', # input_pcm_format
  '0x00', # input_pcm_sample
  '0x00', # output_pcm_sample
  '0x01', # input_data_path
  '0x01', # output_data_path
  '0x00', # input_transport
  '0x00', # output_transport
  '0x000D', # max_latency
  '0x0308', # packet_type
  '0x02', # retransmission_effort
]

data = args.map { |n| binary(n) }.flatten.join(" ")
cmd = "hcitool cmd #{ogf} #{ocf} #{data}"

puts cmd
puts `#{cmd}`