packet size 1 - max:
    file request
    format: `[filename]`

packet size 2 - max:
    hash request
    format: `[filename]:`
    regex name: `hash_request_regex`

packet size 3 - max:
    missing packet request
    format: `[filename]/[packet number]/[packet number]/...`
    regex name: `missing_packet_request_regex`