Can not send downlink using chirpstack V4

[zeara]

problem: device uplink works fine, but downlink seems not working.

env: ubuntu 18.04
chirpstack docker: v4 rc2
using rak gateway
all configs using default except regions, i use AS923

• i use chirpstack web ui to Enqueue a downlink
• the logs just show Device queue-item enqueued but the device can not receive the downlink
  
  

my device profile

what i did wrong?

[brocaar]

There is some important information missing:

• Did the device join the network (ABP or OTAA)?
• Is this a Class-A/B/C device?
• Did the device send an uplink after the enqueue?

[zeara]

• Did the device join the network (ABP or OTAA)?
  Yes, using OTAA
• Is this a Class-A/B/C device?
  class A
• Did the device send an uplink after the enqueue?
  Yes,

[brocaar]

Can you share the LoRaWAN frames? As well did you see any errors?

[zeara]

i can’t see any error log on the terminal

• i just enqueue an downlink as below
  
  
• then manual trigger the uplink
  
  
  
  
  
  
  
  

[zeara]

after i edited as923.toml, add extra_channels to use more channels(i confirmed gateway support and enabled these channels)

  [[network_server.network_settings.extra_channels]]
  frequency=923200000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=923400000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=923600000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=923800000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=924000000
  min_dr=0
  max_dr=5
  
  [[network_server.network_settings.extra_channels]]
  frequency=924200000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=924400000
  min_dr=0
  max_dr=5

when i restart chirpstack, the downlink not working;

but finally i remove these lines and then restart chirpstack the downlink works fine. (maybe 9232, 9234 was default channels? sometimes i can see 9232,9234 in lorawan frames even i remove them)

  [[network_server.network_settings.extra_channels]]
  frequency=923200000
  min_dr=0
  max_dr=5

  [[network_server.network_settings.extra_channels]]
  frequency=923400000
  min_dr=0
  max_dr=5