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# Waltham-receiver
waltham-receiver component is a receiver side implementation for using
Waltham protocol to obtain and process remote output received from
waltham-transmitter
This component is designed to be used for evaluating the functionalities of
waltham-transmitter plugin.
This component also acts as weston client application to display/handle various
requests from actual weston client at transmitter side.
###Architecture
````
ECU 1 ECU 2
+-----------------------------------------------------+ +----------------------------------------------+
| +-----------------+ | | |
| | IVI-Application | | | +-----------+-----------+ |
| +-----------------+ | | | Gstreamer | | |
| ^ | Buffer -----------------------> (Decode) | | |
| wayland | +----------------------/ | +-----------+ | |
| v | | (Ethernet) | | Waltham-receiver | |
| +----+---------------------+ | | ----------------------------> | |
| | | Transmitter Plugin |<-----------------------------/ | +-----------------------+ |
| | | | | | Waltham-Protocol | ^ |
| | | +-------------------+ | | | wayland | |
| | | | waltham-renderer |------------+ | | v |
| | | |(gstreamer Encode) | | | +---------------------+ |
| | +-+-------------------+ | | | | |
| | | | | | WESTON | |
| | WESTON | | | | | |
| +------+-------------------+ | | +----------------+----+ |
| | | | | |
| v | | v |
| +------------+ | | +----------+ |
| | Display | | | | Display | |
| | | | | | | |
| +------------+ | | +----------+ |
+-----------------------------------------------------+ +----------------------------------------------+
````
###Build Steps
1. Prerequisite before building
weston, wayland, waltham and gstreamer should be built and available.
2. In waltham-receiver directory, create build directory
$cd waltham-receiver
$mkdir build
$cd build/
3. Run cmake
$cmake ../
$cmake --build .
4. waltham-receiver binary should be availaible in build directory
###Configure pipeline
You can use gstreamer pipeline as you want by configuring from "pipeline_receiver.cfg".
This file should be in the folder "/etc/xdg/weston/".
As an example, please refer to the example file named "pipeline_receiver_example*.cfg".
-pipeline_receiver_example_general.cfg : Does not use any HW decoder.
-pipeline_receiver_example_intel.cfg : Use Intel's HW decoder.
-pipeline_receiver_example_rcar.cfg : Use Rcar's HW decoder.
Rename file as "pipeline_receiver.cfg" and put in correct place when you use them.
###Connection Establishment
1. Connect two board over ethernet.
2. Assign IP to both the boards and check if the simple ping works.
For example:if transmitter IP: 192.168.2.51 and Waltham-Receiver IP: 192.168.2.52 then
$ping 192.168.2.52 (you can also ping vice versa)
3. Make sure that IP address specified in the weston.ini under [transmitter-output] matches the Waltham-Receiver IP.
4. Make sure that IP address in pipeline.cfg on the transmitter side match the Waltham-Receiver IP.
###Basic test steps
1. Start weston at receiver side
$weston &
2. Run waltham-receiver
$waltham-receiver -p < port_number > -v &
3. Start weston with transmitter plugin at transmitter side, run application and put it on transmitter screen.You should see the application rendered on receiver display.
Connection established -receiver side logs:
````
set_sigint_handler >>>
<<< set_sigint_handler
receiver_listen >>>
<<< receiver_listen
watch_ctl >>>
<<< watch_ctl
Waltham receiver listening on TCP port 34400...
receiver_mainloop >>>
receiver_flush_clients >>>
<<< receiver_flush_clients
listen_socket_handle_data >>>
EPOLLIN evnet received.
receiver_accept_client >>>
client_create >>>
watch_ctl >>>
<<< watch_ctl
Client 0xaaaadc4cde70 connected.
<<< client_create
<<< receiver_accept_client
<<< listen_socket_handle_data
````
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