Changing txFreq with castEnableParameter / castSetParameter causes connection failure

[NaoGueMe]

Hello,

I am using the Clarius Cast SDK (C++) to acquire buffered RF/IQ data from a Clarius L15 probe. The connection and raw data download work correctly when no parameters are modified.

However, when I try to enable and change the transmit frequency (txFreq) parameter, the probe connection fails and the raw data request stops working.

What works

My workflow normally is:

• Connect to the probe using castConnect
• Acquire images
• Freeze the probe
• Request raw buffered data using castRawDataAvailability
• Download raw data using castRequestRawData and castReadRawData

This works correctly and I can successfully retrieve RF/IQ data.

What fails

When I try to enable and modify the transmit frequency parameter, the connection becomes unstable.

Example code:

castEnableParameter("txFreq", 1, onReturn);
castSetParameter("txFreq", 15.0, onReturn);

After running this, the following happens:

• The SDK reports an error when changing the parameter
• The Cast port appears to close
• Subsequent raw data requests fail

Console output:

[cast] return retCode=0
[cast][ERROR] change parameter error: Exception ocurred (Invalid message response for command change parameter (9); contains 0 sub-packets rather than 2))
[cast] return retCode=-1

[cast][ERROR] raw data request failure: Port is closed (Write of 100 bytes failed with error: Bad file descriptor)
[cast] raw availability res=-1 n_iqrf=0

After this error, I cannot retrieve raw data anymore until I restart the connection.

Additional observations

• If I do not attempt to enable txFreq, the connection and raw data download work normally.
• The problem appears specifically when trying to enable or change the transmit frequency parameter.
• Other parts of the Cast pipeline (connect, freeze detection, raw download) appear to function correctly.

Questions

• Is txFreq supported through castSetParameter for the L15 probe?
• Does the parameter need to be set in a specific imaging state (e.g., while streaming vs frozen)?
• Are there additional parameters (e.g., preset, aperture, focus) that must be configured before modifying txFreq?
• Any guidance would be greatly appreciated.

Thank you.

[clariusk]

no need to enable the parameter, that call is just for boolean parameters, just use castSetParameter()

[NaoGueMe]

no need to enable the parameter, that call is just for boolean parameters, just use castSetParameter()

Thanks for your help!
It works