20,21c20,21
<     data = ''.join(['FFFFFFFFFFFF', macaddress * 20])
<     send_data = '' 
---
>     data = b'FFFFFFFFFFFF' + (macaddress * 20).encode()
>     send_data = b'' 
25,26c25
<         send_data = ''.join([send_data,
<                              struct.pack('B', int(data[i: i + 2], 16))])
---
>         send_data += struct.pack('B', int(data[i: i + 2], 16)