Anatomy of a Socket

A socket is composed of a send/receive logic that actually handles UDP, TCP (including HTTP) communications, and of 6 buffers. Each socket is capable of maintaining one connection with another node (host) on a network.

The socket object contains properties, methods and events which relate both to the buffers and the send/receive logic.

The buffers available are:

• The RX buffer, which stores data incoming from the host on the other side of a connection (this buffer doesn't have to be used for HTTP connections ).

• The TX buffer, which stores data which is due for sending to the host on the other side of a connection (for HTTP connection, this buffer can store both the request and the reply).

• The TX2 buffer, which is used internally, and only when inband commands are enabled.

• The CMD buffer, which is used to store incoming inband commands (messages). It is used only when inband commands are enabled.

• The RPL buffer, which is used to store outgoing inband replies (messages). It is used only when inband commands are enabled.

• The VAR buffer, which is used to store HTTP request string. It is needed only when the socket is in the HTTP mode.