(add) Re: [En-Nut-Discussion] NutUdpSendTo doesn't return

[Ulrich Hertlein]

One thing I just noticed:
- when I call the NetUdpSendTo function from the main thread (the one 
that's running the TCP server) it works
- when I call it from the other thread it hangs

Do I have to take some precaution about thread safety with networking?
Cheers,
/Ulrich

Ulrich Hertlein wrote:
> (I only started with the Ethernut board this month so please forgive any 
> stupid questions/assumptions on my part.)
> 
> A program I'm working on is driving me nuts (so to speak):
> - a list of hosts with IP and MAC addresses is stored in EEPROM and read 
> once upon startup
> - the main thread waits for and processes TCP connections on port 23
> - a second thread checks port D (pins 6 & 7)
>   - either sends Wake-On-LAN packets to the hosts
>   - or it sends a UDP 'halt' command to the hosts (where another prog. 
> listens and initiates a shutdown)
> 
> Wake-On-LAN (via NutEtherOutput) works find but NutUdpSendTo never 
> returns. Some debugging puts() hint at an ARP cache problem...
> If I uncomment the NutUdpSendTo the program works nicely.
> 
> Has anyone experienced something similar?
> Thanks in advance,
> /Ulrich

-- 
Ulrich Hertlein | Software Development

ART+COM AG
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