import struct
import io
import binascii
from trezorlib import messages, protobuf, mapping

message = messages.DebugLinkDecision(yes_no=True)

writer = io.BytesIO()
protobuf.dump_message(writer, message)
data = writer.getvalue()
header = struct.pack(">HL", mapping.get_type(message), len(data))

total = header + data

print(binascii.hex