Annick, > On 20 Oct 2014, at 17:12, Annick Fron <l...@afceurope.com> wrote: > > Thank you but your explanation does not explain what is the type (signed > unsigned) and the size of each header component. > Thus it is impossible to work with that.
I think you are making this way more difficult than it is. ZTimestampSNTPClient>>#sync contains a simple, runnable example of using datagrams (with a busy wait blocking the calling thread, which is only good for something simple, because normally datagrams are asynchronous, but that is another story). What you get back from #receiveUDPDataInto: is an Array with 4 elements: - number of bytes received, Integer - address of sender, ByteArray (use NetNameResolver if necessary) - port of sender, Integer - whether more datagrams are available for reading, Boolean The data is in the reallocated buffer that you supplied, aStringOrByteArray. This is all perfectly useable at the Pharo level. The question about signed/unsigned sounds like a C question, for which this is the wrong list, no ? I am sure it is quite easy to find C code that works with datagrams on your platform. A byte array is an unsigned char array as far as I remember ... What you put inside the datagram, is up to you and your application. HTH, Sven > Annick > > Le 17 oct. 2014 à 19:09, Sven Van Caekenberghe <s...@stfx.eu> a écrit : > >> Yes, you have to use the methods in the protocol 'datagrams' of Socket. >> >> When you receive a datagram, the IP:PORT of the other party is included, see >> #receiveUDPDataInto:'c comment. >> >> It is all a bit low level, but it works well. >> >> On 17 Oct 2014, at 18:15, Annick Fron <l...@afceurope.com> wrote: >> >>> Thank you, but I am confused. >>> I have checked your NTP code, and it uses >>> sendUDPData and not sendData. Same for receiveUDPData. >>> Besides how is it possible to know where the message comes from in a >>> broadcast mode ?? >>> Annick >>> Le 17 oct. 2014 à 17:35, Sven Van Caekenberghe <s...@stfx.eu> a écrit : >>> >>>> UDP is pretty easy, just send and receive byte arrays basically, mostly >>>> non-blocking. >>>> >>>> http://forum.world.st/UDP-Listener-example-td4362851.html >>>> http://forum.world.st/SysLogSender-UDP-td4745862.html >>>> >>>> The API is all in Socket. >>>> >>>> On 17 Oct 2014, at 17:09, Annick Fron <l...@afceurope.com> wrote: >>>> >>>>> Hi, >>>>> >>>>> I was not able to find a UDP example in pharo. >>>>> >>>>> There are only TCP examples. >>>>> >>>>> Any pointer ? >>>>> >>>>> Annick >>>>> >>>> >>>> >>> >> >
