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Mirametrix S2 gaze tracker: general-purpose value sending (GPI) always fails

I am using the Mirametrix S2 gaze tracking device. API docs (v1.1) say that the ENABLE_SEND_GPI allows the tracking client to insert data into the gaze. Copying some example code, I tried the following:

 sock.send('<SET ID="ENABLE_SEND_GPI" STATE="1" />\r\n') sock.send('<SET ID="GPI_NUMBER" VALUE="1" />\r\n') sock.send('<SET ID="GPI1" VALUE="INTERVAL" />\r\n')

I get the following in response:

 <ACK ID="ENABLE_SEND_GPI" STATE="1" /> <ACK ID="GPI_NUMBER" VALUE="1" /> <ACK ID="GPI1" ERR="Invalid GPI ID" />

I tried many different combinations of identifiers, but only the ones that get the answer are GPI1 via GPI10 , and each one is rejected for an Invalid GPI ID . What am I doing wrong?

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Mirametrix returned to me. This seems to be a bug in their tracking software. They have a patch.

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