GPU Display GUI: First version of protocol to send updates between frontend and GUI

[davidrohr]

No description provided.

[alibuild]

Error while checking build/O2/fullCI_slc9 for ced3685 at 2026-10-16 00:49:

## sw/BUILD/O2-RTC-test-latest/log
/tmp/o2cagpu_rtc_136_1839901027_72.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_72.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_22.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_22.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_65.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_65.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_76.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_76.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_84.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_59.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_59.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_84.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_72.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_22.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_65.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_45.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_45.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_76.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_0.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_0.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_59.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_84.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_53.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_53.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_8.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_8.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_9.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_9.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_45.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_46.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_46.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_0.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_32.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_32.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_53.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_81.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_81.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_8.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_26.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_26.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_73.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_73.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_63.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_9.cu(8545): error: no instance of function template "o2::gpu::GPUCommonMath::Max" matches the argument list
/tmp/o2cagpu_rtc_136_1839901027_63.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_6.cu(2396): error: identifier "GPUSettingsParam" is undefined
/tmp/o2cagpu_rtc_136_1839901027_6.cu(2380): error: incomplete type "o2::gpu::GPUSettingsRec" is not allowed
/tmp/o2cagpu_rtc_136_1839901027_28.cu(2396): error: identifier "GPUSettingsParam" is undefined
[0 more errors; see full log]

Full log here.