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TODO

Solid, platform independent multicast

Current implementation state:

  • SO_REUSEADDR=1 to allow different servers simultaneously.
  • 0.0.0.0 (IPv4) and interface index 0 (IPv6) as interface for membership should select OS default interface.
  • On OSX, ifindex 0 does not work:
  • Join 224.0.1.187, ff02::fd, and ff05::fd.
    • OSX needs ff02::1 joined explicitly.

(Remember configuring firewall accordingly.)

Tests:

Desktop (Arch Linux)        ok
Notebook (Arch Linux)       ok
Debian (7.7, KVM)           IPv6 fail (timeout)
Ubuntu (12.04, Travis CI)   IPv6 fail (timeout)
OSX (10.9.5, KVM)           ok

Better blockwise transfer support

Current implementation state:

  • The server supports control usage of block messages, so block only works for outbound documents.

Features to be implemented:

  • Handling of blockwise PUT or POST.
  • Caching of documents so that a Rack app call is not necessary for every block.

More detailed CoAP implementation

Examples for missing or unsufficient features:

  • Transmission Parameters (4.8.)
  • Validation of ETag (conditional requests)
  • Request validations and error responses

Non-blocking I/O

  • Check if I/O in Rack environment blocks or can block and what possibilities exist to make it non-blocking.

Observe

  • Garbage collection.
  • Observe on .well-known/core returns "Resource not observable" but Observe actor still calls Rails in tick.