Here is another VIDEO demo'N using GSTREAMER for REMOTE RIG QRQ CW operations on HF

brief demo of a REMOTE RIG OPERATIONS setup to conduct a remote RIG TRANSMIT//RECEIVE session - operating the rig remotely in another room of the house(or from anywhere over the internet) using GSTREAMER SCRIPTS...and a RASPBERRY PI::RIG INTERFACE

RASPBERRY PI GSTREAMER SCRIPTS
using a USB Soundcard(alsa)
*********************************************************************
RECEIVE AUDIO FROM THE RIG to the REMOTE OP:
gst-launch-1.0 -v alsasrc ! audio/x-raw, endianness=1234, signed=true, width=16, depth=16, rate=48000, channels=1, format=S16LE, layout=interleaved ! audioconvert ! audioresample ! queue ! udpsink host=(IP address of the REMOTE OP) port=5001
AUDIO FROM THE REMOTE OP to the RIG for TRANSMIT:
gst-launch-1.0 -v udpsrc port=5002 ! audio/x-raw, endianness=1234, signed=true, width=32, depth=32, rate=48000, channels=2, format=F32LE, layout=interleaved ! audioconvert ! audioresample ! alsasink buffer-time=60000

REMOTE OP's LAPTOP GSTREAMER SCRIPTS
*****************************************************************
SEND AUDIO for RIG TRANSMIT to the PI::RIG INTERFACE
gst-launch-1.0 -v jackaudiosrc ! audio/x-raw, endianness=1234, signed=true, width=32, depth=32, rate=48000, channels=2, format=F32LE, layout=interleaved ! audioconvert ! audioresample ! queue ! udpsink host=(IP address of the PI) port=5002

RECEIVE AUDIO from the RIG
gst-launch-1.0 -v udpsrc port=5001 ! audio/x-raw, endianness=1234, signed=true, width=16, depth=16, rate=48000, channels=1, format=S16LE, layout=interleaved ! queue ! audioconvert ! audioresample ! queue ! jackaudiosink buffer-time=60000

ZAMGATE LV2 PLUG - sets the amount of FULL BREAK IN QSK HF RECEIVE AUDIO desired...
https://github.com/zamaudio/zam-plugins/tree/master/plugins

TONE to key AUDIO DERIVED PTT KEYING CIRCUIT
http://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer
https://github.com/moddevices/mod-lv2-data/tree/master/plugins/mod-...

AD5DZ CW KEYBOARD
https://youtu.be/l8wKVnA4oGc
https://github.com/recri/keyer

SIMPLE DELAY LINE
https://github.com/swh/lv2/tree/master/plugins
note: this is crucial to find the best delay timing...so that the PTT has enough time to ACTIVATE FULLY before the CW AUDIO TONE arrives to the RIG for TRANSMIT...this also gives you the MOST HF RECEIVE audio between elements, letters, or words... if you can find the "just enough" delay value...to allow the most HF RX audio to your preference

GSTREAMER
https://gstreamer.freedesktop.org/

NOTE: Gstreamer runs very light on the ol RASPBERRY PI 2b used in this demo...and allows the use of ALSA AUDIO ENGINE on the PI's sound card...making things a bit easier to get running...VERSES trying to setup up JACKAUDIO or PULSEAUDIO on the PI

another LIVE video demo of setup for QSO'n CW audio with a friend over the internet using Gtreamer PIPELINES

brief demo of the RECEIVE OP's DESKTOP(LEFT SIDE OF SCREEN)
(Spider-Man represents the USB Webcam view of the SENDING OP)

- RIGHT SIDE of the SCREEN is the SENDING OP's DEKSTOP APPs
the sending OP is sending their USB WEBCAM VIEW to the RECEIVING OP''s ip address...as well as sending CW AUDIO(AD5DZ CW Keyboard) and TEXT MESSAGEs(FLdigi)

CW OP 2(RT SIDE) is sending qrq cw TO CW OP 1(LEFT SIDE) - using the AD5DZ CW KEYBOARD
and
CW OP 2 is sending TEXT MESSAGES to CW OP 1 in REAL TIME using FLDIGI's BPSK500 DIGITAL MODE

a 2 channel GSTREAMER opus audio over ip PIPELINE is used to go from CW OP 1 to CW OP 2....the LEFT CHANNEL is for CW AUDIO(mic too if you would like to add voice to the mix) ...the RIGHT CHANNEL is for FLdigi to send the BPSK500 AUDIO for text messaging

here are the Gstreamer commands used:

GSTREAMER CW TRANSMITTER PIPELINE OP2:
gst-launch-1.0 jackaudiosrc ! audio/x-raw,channels=2 ! audiorate ! audioconvert ! opusenc bitrate=256000 frame-size=20 ! rtpopuspay ! udpsink host=(ip address of CW OP 1) port=12345

GSTREAMER RECEIVER OP1:
gst-launch-1.0 -v udpsrc caps="application/x-rtp,channels=2" port=12345 ! rtpjitterbuffer latency=50 ! queue ! rtpopusdepay ! opusdec ! audioconvert ! queue ! jackaudiosink buffer-time=60000

Here is another video demo - of a QRQ Gstreamer CW OP using WINDOWS 10 for sending and receiving CW "AUDIO OVER IP" with a LINUX QRQ Gstreamer CW OP who is using Lubuntu 18.04 

Brief setup LIVE demo of a QRQ Gstreamer CW QSO between a CWop using WINDOWS 10 and another CWop using LINUX - Lubuntu 18.04

GSTREAMER SCRIPTS USED in this example
***************************************************************
LINUX OP sending cw to the WINDOWS 10
gst-launch-1.0 jackaudiosrc ! audio/x-raw,channels=1 ! audiorate ! audioconvert ! opusenc bitrate=128000 frame-size=20 ! rtpopuspay ! udpsink host=(ip address of win 10 OP) port=4444

WINDOWS 10 OP sending cw to the LINUX OP
gst-launch-1.0 directsoundsrc ! audio/x-raw,channels=2 ! audiorate ! audioconvert ! opusenc bitrate=128000 frame-size=20 ! rtpopuspay ! udpsink host=(ip address of the Linux OP) port=55555

LINUX OP RECEIVING cw from the WINDOWS 10 OP
gst-launch-1.0 -v udpsrc caps="application/x-rtp,channels=2" port=55555 ! rtpjitterbuffer ! queue ! rtpopusdepay ! opusdec plc=true use-inband-fec=true ! audioconvert ! jackaudiosink

WINDOWS 10 OP RECEIVING cw from the LINUX OP
gst-launch-1.0 -v udpsrc caps="application/x-rtp,channels=1" port=4444 ! rtpjitterbuffer latency=60 ! queue ! rtpopusdepay ! opusdec ! audioconvert ! directsoundsink

for more info on QRQ CW see:
http://qrqcwnet.ning.com/

NOTE: on the windows OS, you have to jump through a few hoops...at least in this setup....i was using 2 AUDIO REPEATERS to take the audio from BREAKAWAY PIPELINE 1 and BREAKAWAY PIPELINE 2 to route it to the WINDOWS LAPTOP's REALTEK HD SOUND CARD...so the audio can be heard on the win 10 laptop speakers//headphones etc...

the GSTREAMER SCRIPTS used above for windows...are using the "DEFAULT" sound cards for PLAYBACK and RECORD... and to keep the input from going back out the output...and creating a LOOPBACK ...you have to use different soundcards for RECEIVE and TRANSMIT...
in this example BREAKAWAY PIPELINES are being utilized for the task
https://sites.google.com/site/icwoip/best-virtual-sound-card-for-icw

for the AUDIO REPEATERS, there are a few programs you can use on windows...the idea is to tell FLdigi to use BREAKAWAY PIPELINE 2 to act as the transmitting capture device to go out over GSTREAMER, however, you would not be able to hear FLdigi's sidetone unless you use an audio repeater to take the audio going through BREAKAWAY PIPELINE 2 and send it to the WIN 10 soundcard too, so it can be monitored...etc...same for BREAKAWAY PIPELINE 1...which is acting as the audio device for the RECEIVE GASTREAMER Pipeline from the Linux OP sending to the WIN 10 op