Server maintains a queue of outbound packets for each user

Packets which are older than MAX_QUEUE_TIME are discarded

Each incoming request to the server takes up to MAX_BATCH_DOWN bytes
from the queue and returns them as the POST response body payload

Each incoming request contains up to MAX_BATCH_UP bytes of payload.
It's a multipart/form-data.

Authentication: for now, plaintext password

Sever side configuration:
 Per user but normally global
  MAX_MAX_BATCH_DOWN MAX_MAX_QUEUE_TIME
 Global
  MTU
 Per user
  PASSWORD

Client side configuration;
 MAX_BATCH_DOWN MAX_QUEUE_TIME PASSWORD

Routing assistance: none needed; secnet polypath will DTRT

Client form parameters:
 I MBD MQT P D