upload. When the client receives an ACK0, it will remove 0 from the range,\r
get the next block number, which is 1, then upload the BLOCK1. For RRQ\r
without option negotiation, the server will directly send the BLOCK1\r
upload. When the client receives an ACK0, it will remove 0 from the range,\r
get the next block number, which is 1, then upload the BLOCK1. For RRQ\r
without option negotiation, the server will directly send the BLOCK1\r