bta-proxy/bta_proxy/packets/packet1login.py

from .base import Packet

class Packet1Login(Packet, packet_id=1):

    FIELDS = [
        ('entity_id_and_proto', 'uint'),
        ('username', ('str', 16)),
        ('pubkey', ('str', 392)),
        ('seed', 'long'),
        ('dimension', 'byte'),
        ('worldtype', 'byte'),
        ('packet_delay', 'byte')
    ]