Hack'n'ACK October '15

Development archive
1

Hello fellow RIOTers,

Cenk and I are holding the castle for tonight’s Hack’n’ACK at FU Berlin. You can join via your favorite PlaceCam link: http://placecam.de/call.php?c=lmakKMrDG8a35aIBNqLBvOnApExkKFntj9xXawGNgTc-

If you never used PlaceCam before, please refer to [1]

Lots of fun and merges tonight, Martine

[1] https://github.com/RIOT-OS/RIOT/wiki/Instructions-for-remote-participation

2

Hi Martine,

What is the actual time for the Hack’n’ACK meeting, I want to join to discuss with RIOTers.

Thanks, Haoyang

3

Hi Haoyang,

yesterday it was too late for joining the session. We’ve already closed the conference at that time. Usually we start the Hack’n’ACK about 17:30 p.m. CET.

If you want to join discussions you can also follow the virtual meetings that take place on wednesdays at 2 p.m. CET if someone put content in a prepared pad. If I see it correctly this pad should be the one for the next potential conference:

? Alternatively you can use this list to discuss anything :-). Best, Peter

4

Thanks Peter,

I encountered an question about DEFAULT program.

the _netif_send is the underlying function for txtsnd, it use genre_netapi_send(dev, pkt) to send the packet. But in pkt_dump process running background, I notice the _eventloop(void *arg), is the codes in charge of printing. The question is:

gnrc_netapi_send is sending GNRC_NETAPI_MSG_TYPE_SND, but in _eventloop, it is the GNRC_NETAPI_MSG_TYPE_RCV type, because the stdout result shows “PKTDUMP: data received:”. Is there any problem?

Thanks, Haoyang

5

Hi Haoyang,

I’m not quite sure if I got your question. But I can try to solve some confusion. Se me comments inline!

  • The command “txtsnd” in the default example sends plain data over an interface, without using other protocols - netapi is an IPC mechanism to communicate between modules/threads in the network-stack - pkd_dump you can understand as a receiver thread. You register it for some kind of protocol and if this kind is received, pkt_dum just prints the packets contents to the console - GNRC_NETAPI_MSG_TYPE_SND and GNRC_NETAPI_MSG_TYPE_RCV are two types of the communication mechanism netapi. Like the names already say, one type is used when there is data to send (network-stack from top to bottom) and the other is used when there is data received (network-stack bottom to top). If you are still confused, could you explain your scenario and the existing problem in a bit more detail? Cheers, Peter