On July 31st, 2024, CST has published a complete document on Regulations involving the devices and services considered as Internet of Things (IoT), which is turning official the exact description of what is considered an IoT device, and an IoT service, also reinforcing the need of CST approval. A conformity certificate shall be obtained from CST for those devices before being imported or used.
You can check the complete document on the link, and it will be into force by September 30th (60 days after publication).
Type Approval Impacted? Yes
Spectrum Impacted? No
Imports Impacted? Yes