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FreeRTOS+TCP is still in the lab
FreeRTOS+TCP is already used in commercial products and we encourage you to try it yourself. Be aware however that we are still refining its design, and the source code and documentation do not yet meet Real Time Engineers Ltd's strict quality standards.
Please use the forum for support, feedback and ideas, or contact us directly if you have a specific business interest.

Port Number

Each single network node can run multiple applications that use the same network interface, and therefore use the same IP address. For example, an RTOS application can run a TFTP server, an echo server and a Nabto client at the same time - all of which make use of the TCP/IP stack. Different applications running on the same network node, and therefore at the same IP address, are identified by their port number.

The source and destination address of each TCP or UDP packet is therefore a combination of an IP address and a port number. The IP address identifies the node on the network and the port number identifies the application within the node (see sockets).

Useful links:

Other networking basics pages:

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