Function otTrelIsEnabled 

pub unsafe extern "C" fn otTrelIsEnabled(
    aInstance: *mut otInstance,
) -> bool

Indicates whether the TREL operation is enabled.

The TREL operation is enabled if and only if it is enabled by both the user (see otTrelSetEnabled()) and the OpenThread stack.

@param[in] aInstance The OpenThread instance.

@retval TRUE if the TREL operation is enabled. @retval FALSE if the TREL operation is disabled.