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# Presentation API Demo
This directory contains a demo of a Presentation API controller and receiver.
The demo supports flinging a URL to start a presentation and stopping the
presentation.
## Command line options
The same executable is run for the controller and receiver; only the command
line options affect the behavior. The command line options are:
``` bash
$ osp_demo [-v] [friendly_name]
```
- `-v` enables verbose logging.
- Specifying `friendly_name` puts the demo in receiver mode and sets its name
to `friendly_name`. Currently, `friendly_name` won't appear in any of the
controller-side output related to this screen though. If no friendly name is
given, the demo runs as a controller.
## Log output
Because the demo acts like a shell and accepts commands on `stdin`, the logging
output is redirected to a separate file so it doesn't flood the same display.
You have to create these files on your machine before running the demo. For the
controller, this file should be named `_cntl_fifo` and for the receiver, it
should be named `_recv_fifo`. The simplest way to do this is so you can see the
output while the demo is running is to make these named pipes like so:
``` bash
$ mkfifo _cntl_fifo _recv_fifo
```
Then `cat` them in separate terminals while the demo is running.
## Listener commands
- `avail <url>`: Begin listening for receivers that support the presentation of
`url`.
- `start <url> <service_id>`: Start a presentation of `url` on the receiver
specified by the ID `service_id`. `service_id` will be printed in the output
log once `avail` has been run. The demo only supports starting one
presentation at a time.
- `msg <string>`: Sends a string message on the open presentation connection.
- `close`: Close the open presentation connection without terminating the
presentation.
- `reconnect`: Reconnect the previously-connected presentation connection.
This allows using the `msg` command again.
- `term`: Terminate the previously started presentation.
## Publisher commands
- `avail`: Toggle whether the receiver is publishing itself as an available
screen. The receiver starts in the publishing state.
- `close`: Close the open presentation connection without terminating the
presentation.
- `msg <string>`: Sends a string message on the open presentation connection.
- `term`: Terminate the running presentation.
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