Gary,
Here's a tcpdump in my case of the UDP test on port 13 between two different systems (192.168.0.1 and 192.168.0.2) : # tcpdump -i net1 -nn -n -A port 13 dropped privs to nobody tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on net1, link-type EN10MB (Ethernet), capture size 262144 bytes 20:15:17.760479 IP 192.168.0.1.49167 > 192.168.0.2.13: UDP, length 11 E..'.W.....................xhello world 20:15:17.767964 IP 192.168.0.2.13 > 192.168.0.1.49167: UDP, length 26 E..6....<..b............."..Tue Jan 12 20:15:16 2021 ^C 2 packets captured The host 192.168.0.1 is running GNU smalltalk. The host 192.168.0.2 is the one running the datagram daytime service. Regards, David Stes ----- Op 12 jan 2021 om 17:28 schreef Gary Highberger gary.highber...@gmail.com: > Hi David and everybody, > > I just sent my first UDP packet with Smalltalk Sockets. It's likely just me > but there might be some instability in gst. Somehow my Datagram Socket got > wiped out. I'm going to run tests and publish my findings here. > > Have GNU Smalltalk Sockets and the VM been proven in real world > applications? > > Packet: > $ sudo tcpdump -i 1 -nn -n -A port 49152 > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on wlp3s0, link-type EN10MB (Ethernet), capture size 262144 bytes > 10:53:15.131345 IP 192.168.1.114.49153 > 192.168.1.249.49152: UDP, length 27 > E..7..@.@..0...r.........#.. Hi sailor! New in town? > > Smalltalk: > st> PackageLoader fileInPackage: 'Sockets' > "Global garbage collection... done" > Loading package Sockets > PackageLoader > st> DgS := Sockets.DatagramSocket remote: '192.168.1.249' port: 49152 > local: '192.168.1.114' port: 49153 > Sockets.DatagramSocket[192.168.1.114:49153] > st> DgD := Sockets.Datagram data: ' Hi sailor! New in town? ' > a Datagram > st> DgS nextPut: DgD > Sockets.DatagramSocket[192.168.1.114:49153] > Voila > > Many thanks for the help everybody! > > Gary > > On Sun, Jan 10, 2021 at 1:49 PM Gary Highberger <gary.highber...@gmail.com> > wrote: > >> Hello David and all, >> >> I have a few (noob) questions about the UDP example Smalltalk program. >> More questions likely to follow as I come up to speed. Your patience is >> much appreciated David and everybody. >> >> QUESTIONS: >> • Is "_" the preferred assignment operator? I've been seeing ":=" too. I >> don't have a back arrow on my keyboard. I guess the PARC people used "_". >> >> • Does statement 1) >> assign the destination IP address? Note that for my application, the >> source and destination addresses will be different. >> >> • Does statement 3) >> populate the (UDP) datagram socket with the message, port, and address? >> Why a "#" symbol prefixing the message string, 'hello world'? >> >> • Does statement 4) >> create a listening socket? >> >> • Does statement 5) >> trigger the send? >> >> • Does statement 6) >> block until the UDP response? >> >> +---------------------------------------------------------+ >> >> UDP Smalltalk (example) program: >> >> 1) h _ Sockets.SocketAddress createLoopbackHost. >> >> 2) s _ Sockets.DatagramSocket new. >> >> 3) d _ Sockets.Datagram data:#'hello world' address:h port:13. >> >> 4) answer _ Sockets.Datagram new. >> >> 5) s nextPut:d. >> >> 6) s receive:answer. >> >> 7) (answer data) asString printNl. >> >> 8) s close. >> >> Gary Highberger >> >> >> On Sun, Jan 10, 2021, 8:48 AM Gary Highberger <gary.highber...@gmail.com> >> wrote: >> >>> Good morning David, >>> >>> I'm not familiar with 'daytime' but will come up to speed on it and get >>> it and your use cases running and report my findings for everybody to see. >>> >>> Hopefully netTest.c explains what I'm trying to do with Smalltalk. It's >>> very short and simple. >>> >>> https://www.dropbox.com/s/xc23wj6r5aqh153/netTest.c?dl=0 >>> >>> I used my cell phone as the destination, my home WiFi as the network, and >>> tcpdump to see the packet. >>> >>> Thank you David for the Smalltalk code fragments and introducing me to >>> inetd and 'daytime'. >>> >>> Gary Highberger >>> >>>
