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TCP 5683

ProtocolTCP
Port5683
LabelsConstrained Application Protocol (CoAP)

Synopsis

  • TCP port 5683 is assigned by IANA to the Constrained Application Protocol (CoAP) when carried over TCP (RFC 8323).
  • Eclipse Californium (a widely used Java CoAP stack) implements CoAP over TCP and can run servers that listen on 5683/tcp.
  • libcoap (C library) supports CoAP over TCP; its coap-server example and many embedded builds use 5683/tcp.
  • OMA SpecWorks Lightweight M2M 1.1 standardizes LwM2M over CoAP/TCP; Eclipse Leshan 2.x (built on Californium) can be configured to accept device connections on 5683/tcp.
  • AVSystem Anjay (LwM2M client) implements CoAP over TCP and interoperates with LwM2M servers on 5683/tcp.
  • The secure variant (CoAP over TLS) typically uses 5684/tcp, while 5683/tcp is used for non-TLS CoAP services.

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