It is indeed about *receiveDataInto:fromHost:port:* I am talking about. Its *fromHost* parameter is not of the same nature as the *toHost* parameter in the message *sendUDPData:toHost:port: * In the former it is expected a ByteArray to work, in the later a SocketAdress. *About the context. *This school year I am doing basic Pharo programming with Dr.Geo (12 and 13 years old). I wrote a school book[1] for that. But It is a bit tedious to teach and not enough appealing. It may just be my fault or the format of the book. For the next semester, I will explore alternative format, in more independent teaching unit. For the longer term, I want to explore alternative way of teaching Pharo, more appealing. Something more in the kids interest area. Do you know Minetest, it is a free implementation of Minecraft? It comes with a server software and client instances communicating with the server with a dedicated UDP protocol. In the past, we use it in an architecture project in connexion with math. Written with Pharo, I envision a Minetest client using the UPD protocol to interact with a server. This Pharo written client will be used as a programming environment to control the kid avatar in the Minetest 3D world, like a BotsInc of 3D. The Pharo client will not render the view, it will be done by the usual Minetest client. For example, a kid could code the behaviour of his avatar to build a tower with a Minetest DSL: ../.. 100 timesRepeat: [ avatar goUp 4 timesRepeat: [ 10 timesRepeat: [avatar dropBrick; moveForward]. avatar turnLeft] ] There are some extensions in Minetest client (Mod in Minetest terminology) to do some basic programming but it is not as interesting as could be Pharo programming with a dedicated DSL[3]. I speculate it could be pretty cool and it should meet a lot of success among kids. Plus provide good teaching interest and more Pharo awareness. Hilaire [1] https://launchpad.net/drgeo/trunk/19.09/+download/programmer-avec-drgeo.pdf [2] http://www.minetest.net [3] https://forum.minetest.net/viewtopic.php?f=14&p=365620&sid=5d825763b9cb5579c... ----- http://drgeo.eu -- Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html