Hi @dudi, and thanks for your query. The Tobii 4C is indeed built upon the IS4 architecture, so you should be able to use the Tobii Stream Engine API for Linux in conjunction with your device.
To get started, please checkout the tutorial @ https://developer.tobii.com/consumer-eye-trackers/stream-engine/getting-started/
which provides the relevant download links. Please note this software is still alpha so very limited support is provided.
There is also the option to run the Tobii Pro SDK Linux Bindings with your device but this require the purchase of a special licence and unlock file to do so. If you are interested, kindly send a speculative email to [email protected] for a quote.
With reference to issues running the IS5, please kindly log an incident request with the Tobii Experience Support @ https://help.tobii.com/hc/en-us/requests/new and one of the team there will get back to you promptly. Thanks for your understanding.
Please let us know if we can be of any further assistance.