Protocol for the reconnector:
| Message | Code | Parameters | Description |
| Start Session | 0x01 | client id - 4 bytes | Client->Server. Start a new session for the client. If a session is already active, this will kill it. Client's first message id will be 0x0000. Expects a Session Started or Session Rejected. |
| Reconnect Session | 0x02 | client id - 4 bytes last acked message id - 2 bytes |
Client->Server. Reconnect to an active session. Expects a Session Started or Session Rejected. |
| Session Started | 0x03 | client code - 4 bytes last acked message id - 2 bytes |
Server->Client. Client session started successfully. |
| Session Rejected | 0x04 | client code - 4 bytes | Server->Client. Tried to reconnect to a bad session or don't have permission to connect. The TCP stream will close. |
| End Session | The session ends when all connections are closed and the client->server TCP stream closes. | ||
| New Connnection | 0x10 | client message id - 2 bytes connection id - 2 bytes ip address - 4 bytes (network order) port - 2 bytes (network order) |
Client->Server. Create a new TCP connection.
Expects either Connected or Connect failed. The Window is the number of bytes (divided by
256) that the server is permitted to send to the client prior to receiving an ack. The
client window is 0 until the Connected message is received. Must be acked. |
| Connected | 0x11 | server message id - 2 bytes connection id - 2 bytes window - 2 bytes |
Server->Client. Responds with the same message
id as the New Connection message and provides the connection id for the opened
connection. Must be acked. |
| Connect failed | 0x12 | server message id - 2 bytes connection id - 2 bytes errno - 2 bytes |
Server->Client Responds with the same message id as the New Connection message and indicates failure. Must be acked. |
| Connection EOF | 0x13 | message id - 2 bytes connection id - 2 bytes |
Either direction. No further traffic will be sent, but traffic may still be received. The other party should do a shutdown(SHUT_WR). Must be acked. |
| Connection Closed | 0x14 | message id - 2 bytes connection id - 2 bytes |
Either direction. Indicates that connection id is completely disconnected. Must be acked. |
| Data Packet | 0x1f | message id - 2 bytes connection id - 2 bytes window - 2 bytes length - 2 bytes data - length bytes |
Either direction. Send bytes. Must be acked. |
| Keepalive | 0x1f | client message id - 2 bytes connection id - 2 bytes window - 2 bytes length - 2 bytes |
connection id is any connection currently open window is that connection's current receive window in bytes*256. length is exactly 0. |
| Ack | 0x21 | message id - 2 bytes window - 2 bytes |
Either direction. Acknowledge receipt of a message. The other end may remove the message from its buffer.Also specify the remaining number of bytes divided by 256 which the remote end is permitted to send for this connection id. |
Corner case problem: nack and wait sent then proxy-proxy connection fails.