Packet::Connect.new(
 :client-identifier<mosquitto_sub_3926>,
 :username<guest>
 :password(buf8('passw0rd'.encode))
 :60keep-alive-interval,
)

10 2f 00 04  4d 51 54 54    04 c2  00 3c 00 12
6d 6f 73 71  75 69 74 74    6f 5f 73 75  62 5f 33 39
32 36 00 05  67 75 65 73    74 00 08 70  61 73 73 77
30 72 64
