Minutes from face to face meeting @ FU Berlin on September 27, 2013

Minutes from the Face-to-Face developer meeting @ FU Berlin on September 27, 2013

Local participants: Lotte Steenbrink, Christian Mehlis, Oleg Hahm, Ludwig Ortmann Skype participants: Thomas Eichinger, Martin Landsmann Minute taker: Ludwig

Agenda

1.) Message API Problems 2.) Merging Policy 3.) Features for the next release 4.) C++ integration 5.) Makefiles Windows compatibility 6.) Network stack memory optimization

Message API Problems

• invalid (internal problems in Christian's application)

Merging policy

• reminder: anyone with commit rights should merge as soon as enough people have acknowledged the pull request and the pull request has been open for reviewing $long enough
• trivial changes (like a new header include) can be merged immediately after the first ACK

Features for the next release

• network stack optimization
• POSIX features
  • time.h

    requires changes in the core

    should be fully included in the release

  • pthread.h

    probably complex

    required for libcppa

  • semaphore.h

    should be trivial (about 10 lines)

    already available as part of sixlowpan

    no named semaphores, name resolution returns NULL

    should be fully included in the release

  • Martin Lenders looks at the network part, Christian at the rest
  • Martin Landsmann checks what is needed for libcppa
• basic support for Cortex A9
• destiny fixes
• CoAP
• CCN lite

C++ integration

• currently issues with printf and float (e.g. for the sht-11 on MSB-A2)
• encapsulate with "extern C", pull request follows
• find yet not declared functions and add them to the header
• try to avoid ifdefs
• split up the pull request (wherever possible)

Makefiles Windows compatibility

• the according pull request needs to be updated and should be merged (no further objections)

Network stack memory optimization

• currently every abstraction layer holds its own buffer

• the upper layers should share one buffer, possibly using Stephan Zeisbergs memory manager

• the lower layers (driver and transceiver module) should use one buffer together

• possible real-time improvement: driver just informs the transceiver module, which fetches the packet from the radio

• additional: check defined stack sizes and try to minimize them

Next meeting: Since the next release is envisioned for November (due to CoAP plugtest (20.11. and SAFEST demo (25.11)) -> 28.10 - 1.11., Doodle follows