Google Cloud IoT device SDK for embedded C  1.0.2
Data Structures
Here are the data structures with brief descriptions:
 Ciotc_connection_data_sThe MQTT CONNECT parameters
 Ciotc_crypto_key_data_tThe parameters with which to create JWTs
 Ciotc_crypto_key_union_uThe public or private key data
 Ciotc_sub_call_params_uThe operational data for the user-defined subscription callback