Network Protocol

Igor network protocol is used to transfer data (for example, Igor service packets) over TCP stream.

Packets

Data stream is the sequence of binary packets.

Packet encoding:

Field	Byte Size	Description
Size	1..4	Variable-length encoded payload size
Payload	0..0x0FFFFFFF	Application-specific payload

Zero-size payload means disconnect request. The connection should be shutdown.

Service Maps

Depending on application needs, packet payload may just contain a single service message, or a service map packet.

Service map encoding:

Field	Byte Size	Description
Service	1	Service id
Service message	0..0x0FFFFFFE	Service-specfic message

Service id can be defined as Igor Enum. Most often 1 byte is used as an integer type (but another integer type may be used as well).

See also

• Enum Types

• Enum Encoding

Service maps can be nested. For example, when several players play a split-screen game, a nested service map may be used to multiplex messages for different players.

For Igor service message encoding, see Service Encoding.