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You can read device parameters including I/O states and values. You can do it in a couple of ways:
You can test MODBUS functionality by enabling MODBUS TCP SLAVE and MODBUS TCP MASTER (you might need to download additional packages for these functionalities to appear in the Services menu in the WebUI. You can do it by navigating to Package manager) and configuring MODBUS requests. More details on request configuration is found here: https://wiki.teltonika-networks.com/view/RUT955_Modbus#Requests_Configuration.
If necessary, I can forward you an example configuration on how to send MODBUS data vis MQTT to AWS.