//
ClientAuth ca = ClientAuth.newBuilder().setUsername(username).setNetReadTimeout(10000).setNetWriteTimeout(
10000).build();
writeWithHeader(
channel,
Packet.newBuilder().setType(PacketType.CLIENTAUTHENTICATION).setBody(ca.toByteString()).build().toByteArray());
//
Packet ack = Packet.parseFrom(readNextPacket(channel));
if (ack.getType() != PacketType.ACK) {
throw new CanalClientException("unexpected packet type when ack is expected");
}