How to make a three node link

[akhaldi]

Hello this is a continuation of the discussion on this link:
Add primary/secondary role for multi-instance setup

Do you use mavlink router?
No

Does mavlink inspector in QGC receive any mavlink packets?
yes, but all sent are loss messages

What wfb-cli shows in intermediate node and in ground station?
both connected and receiving packets at a normal rates

my cfgs

drone cfg

[common]
wifi_channel = 165
log_file = None
link_id = "default"

###############################
### DRONE PART
###############################

[drone_video]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index


[drone_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncoment if you need to forward mavlink stream
peer = 'serial:/dev/ttyS0:115200' # Serial port for autopilot


[drone_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli


###############################
### GS PART
###############################

[gs_video]
# gs video is RX only, so you doesn't need to specify ldpc, stbc, gi and mcs_index
bandwidth = 20     # bandwidth 20 or 40 MHz
stats_port = 8002  # used by wfb-cli
peer = 'connect://127.0.0.1:5600'  # outgoing connection for video sink (OSD or QGC), use 224.0.0.1 for multicast streaming

[gs_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncomment and set QGroundControl address
#peer = 'connect://192.168.1.1:14550'

# OSD
mirror = 'connect://127.0.0.1:14551'

[gs_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli

ground cfg

[common]
wifi_channel = 64
log_file = None
link_id = "Ground_Link"

###############################
### DRONE PART
###############################

[drone_video]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index


[drone_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncoment if you need to forward mavlink stream
#peer = 'serial:/dev/ttyS0:1500000' # Serial port for autopilot


[drone_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli


###############################
### GS PART
###############################

[gs_video]
# gs video is RX only, so you doesn't need to specify ldpc, stbc, gi and mcs_index
bandwidth = 20     # bandwidth 20 or 40 MHz
stats_port = 8002  # used by wfb-cli
peer = 'connect://192.168.2.20:5600'  # outgoing connection for video sink (OSD or QGC), use 224.0.0.1 for multicast streaming

[gs_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncomment and set QGroundControl address
peer = 'connect://192.168.2.20:14550'

# OSD
#mirror = 'connect://127.0.0.1:14551'

[gs_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli

ifaddr = '10.5.0.3/24'

intermediate node drone link

[common]
wifi_channel = 165
primary = True
log_file = None
link_id = "default"

###############################
### DRONE PART
###############################

[drone_video]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8012

[drone_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8011  # used by wfb-cli

# Uncoment if you need to forward mavlink stream
#peer = 'serial:/dev/ttyS0:1500000' # Serial port for autopilot


[drone_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8013  # used by wfb-cli


###############################
### GS PART
###############################

[gs_video]
# gs video is RX only, so you doesn't need to specify ldpc, stbc, gi and mcs_index
bandwidth = 20     # bandwidth 20 or 40 MHz
stats_port = 8002  # used by wfb-cli
peer = 'connect://127.0.0.1:5600'  # outgoing connection for video sink (OSD or QGC), use 224.0.0.1 for multicast streaming

[gs_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncomment and set QGroundControl address
peer = 'connect://127.0.0.1:14550'

# OSD
#mirror = 'connect://127.0.0.1:14551'

[gs_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli

intermediate node ground link

[common]
wifi_channel = 64
primary = True
log_file = None
link_id = "Ground_Link"

###############################
### DRONE PART
###############################

[drone_video]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index

peer = 'listen://127.0.0.1:5600'
stats_port = 8052

[drone_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8051  # used by wfb-cli

peer = 'listen://127.0.0.1:14550'

[drone_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8053  # used by wfb-cli

ifname = 'ground-link-wfb'
ifaddr = '10.5.0.4/24'

peer = 'listen://127.0.0.1:14801'

###############################
### GS PART
###############################

[gs_video]
# gs video is RX only, so you doesn't need to specify ldpc, stbc, gi and mcs_index
bandwidth = 20     # bandwidth 20 or 40 MHz
stats_port = 8042  # used by wfb-cli
peer = 'connect://127.0.0.1:5600'  # outgoing connection for video sink (OSD or QGC), use 224.0.0.1 for multicast streaming

[gs_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8041  # used by wfb-cli

# Uncomment and set QGroundControl address
#peer = 'connect://192.168.1.1:14550'

# OSD
mirror = 'connect://127.0.0.1:14551'

[gs_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8043  # used by wfb-cli

[svpcom]

Intermediate drone link drone part peer is missing. Also intermediate gs line gs part is missing. Remove unused parts from configs to avoid confusion

[akhaldi]

i have cleaned up the cfgs
unfortunately same issue appeared
QGC can receive packets but can't send any

this is drone link after modification

[common]
wifi_channel = 165
primary = True
log_file = None
link_id = "default"
###############################
### GS PART
###############################

[gs_video]
# gs video is RX only, so you doesn't need to specify ldpc, stbc, gi and mcs_index
bandwidth = 20     # bandwidth 20 or 40 MHz
stats_port = 8002  # used by wfb-cli
peer = 'connect://127.0.0.1:5600'  # outgoing connection for video sink (OSD or QGC), use 224.0.0.1 for multicast streaming

[gs_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8001  # used by wfb-cli

# Uncomment and set QGroundControl address
peer = 'connect://127.0.0.1:14550'

[gs_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8003  # used by wfb-cli

and this is ground link

[common]
wifi_channel = 64
primary = True
log_file = None
link_id = "Ground_Link"

###############################
### DRONE PART
###############################

[drone_video]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index

peer = 'listen://127.0.0.1:5600'
stats_port = 8052

[drone_mavlink]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1           # 8812au only
mcs_index = 1      # mcs index
stats_port = 8051  # used by wfb-cli

peer = 'listen://127.0.0.1:14550'

[drone_tunnel]
bandwidth = 20     # bandwidth 20 or 40 MHz
short_gi = False   # use short GI or not
stbc = 1           # stbc streams: 1, 2, 3 or 0 if unused
ldpc = 1
mcs_index = 1      # mcs index
stats_port = 8053  # used by wfb-cli

ifname = 'ground-link-wfb'
ifaddr = '10.5.0.4/24'

peer = 'listen://127.0.0.1:14801'

[akhaldi]

any suggestions to fix the issue?
thanks in advance

[svpcom]

1. Try to setup without intermediate node
2. If it works then try to debug mavlink packets flow step-by-step (add debug print to proxy.py / MavlinkUDPProxyProtocol)

My opinion it that something bad with peer config in intermediate node

[akhaldi]

Hello
thanks for your advice, the three node link was established successfully
but now the question is:
can i get two telemetry channels in the ground because there are two drones and one gs

[svpcom]

yes. set different telemetry port numbers for different wfb-ng instances on gs.

[lida2003]

@akhaldi how about the video latency of this setup?

As I checked previous talks

drone(1 wifi card) --> intermediate node (2 wifi card0 --> ground station(1 or 2 wifi card????)