In the architecture of LoRaWAN, gateways do not have access to the encryption keys required to understand traffic, so they merely pass it in still-encrypted form to servers to make sense of. Within the realm of TTN (which is the topic of these forums) those would be the TTN servers.
If you want to send data to something on AWS IoT, it would not be the raw data from the gateway, it would be the decrypted application data received from the TTN servers.
Dragino LG308 is an excellent LoRaWAN gateway. The other types are probably very well suited for LoRa use, but not for LoRaWAN as they are not standard compliant. So for anyone reading this, if you want LoRaWAN, do not waste money on the LG01 models. If you want LoRa, knock yourself out but please do not ask questions on the TTN forum as that is dedicated to LoRaWAN.