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Streaming data from my robot to Mathematica over UDP

LV VS
Posted 10 years ago
POSTED BY: LV VS
9 Replies
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Marcus M
Marcus M
Posted 6 years ago

Thanks a lot for sharing, Ian.

The error occurs because the InetAddress class has not been loaded. Add this line after InstallJava[]:

LoadJavaClass["java.net.InetAddress"]
POSTED BY: Marcus M
Diego Zviovich
Diego Zviovich
Posted 8 years ago

Hi Ian, I'm getting the exact same error as Pedro. Using version 11.3
POSTED BY: Diego Zviovich

Hi,

When applying the above code, I get the following message after using the writeSocket:

writeSocket[udpSocket, "127.0.0.1", 5000, ToCharacterCode["hello from mathematica"]]

JavaNew::argx: Incorrect number or type of arguments to constructor for class java.net.DatagramPacket. The arguments, shown here in a list, were {{104,101,108,108,111,32,102,114,111,109,32,109,97,116,104,101,109,97,116,105,99,97},22,InetAddress`getByName[127.0.0.1],5000}.

Java::argx1: Method named send defined in class java.net.DatagramSocket was called with an incorrect number or type of arguments. The argument was $Failed.

$Failed

any idea why?
POSTED BY: Pedro Fonseca
Updating Name
Updating Name
Posted 8 years ago
POSTED BY: Updating Name

Ah. Copy/pasting the writeSocket function to the reply section here seems to have taken out some necessary formatting. When I added back in the underscores for the function arguments and matched those arguments to the variables in the function body, all is good.
POSTED BY: Christopher Begley

Good to hear.
POSTED BY: Ian Johnson
POSTED BY: Ian Johnson

Hi Ian, I'm having trouble getting this example to run as written (Mathematica version 11.0.1.0) -- seems to be something in the writeSocket function, possibly InetAddress, but I can't figure it out. Anyone else having trouble? Thanks, Chris
POSTED BY: Christopher Begley

Hi Christopher,

What exactly is the error message you're seeing? It's possible that there were changes in 11.0.1 that broke the code I posted above.

Thanks,

Ian
POSTED BY: Ian Johnson
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