Here are the data structures with brief descriptions:
  BT_HDR | |
| conn_duo | Data structure to hold the two connections |
| OutputStream | A wrapper around a single output AVStream |
| read_args | Shared structure between recv thread and grabber thread |
| s_nfc_params | |
| s_sensor_params | Parameter for sensor threads |
| s_sensor_params_acc | |
 thread_args | Struct holding the state of a recording (filename/lock) |
