Class B downlink

ChirpStack Application Server
1

Dear All,

I use CN470 configuration. The beacon frequency is 505300000, and the ping slot frequency is also 505300000. The node is in class b mode (in uplink frame, classB:true) opens its ping slot every 8 seconds.
[15:02:02.839]收←◆start beacon timer: 2992, current:(1631516541608), next_rx:(1631516544608)
[15:02:05.840]收←◆start rx beacon: 505300000, 2, (1631516544610), rxtime(2120)
[15:02:06.173]收←◆start beacon timer: 124693, current:(1631516544944), next_rx:(1631516672637)
receive beacon
[15:02:13.196]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:20.873]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:28.552]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:36.231]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:43.907]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:51.586]收←◆Rx, Freq 505300000, DR 2, window 4
[15:02:59.265]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:06.943]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:14.620]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:22.300]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:29.978]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:37.655]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:45.333]收←◆Rx, Freq 505300000, DR 2, window 4
[15:03:53.012]收←◆Rx, Freq 505300000, DR 2, window 4
[15:04:00.690]收←◆Rx, Freq 505300000, DR 2, window 4
[15:04:08.368]收←◆Rx, Freq 505300000, DR 2, window 4
[15:04:10.838]收←◆start beacon timer: 2992, current:(1631516669637), next_rx:(1631516672637)
[15:04:13.838]收←◆start rx beacon: 505300000, 2, (1631516672639), rxtime(2120)
[15:04:14.173]收←◆start beacon timer: 124694, current:(1631516672973), next_rx:(1631516800667)
receive beacon
[15:04:17.536]收←◆Rx, Freq 505300000, DR 2, window 4
[15:04:25.214]收←◆Rx, Freq 505300000, DR 2, window 4
[15:04:32.892]收←◆Rx, Freq 505300000, DR 2, window 4

Chirpstack configuration is as follows,
Class-B confirmed downlink timeout :1
Class-B ping-slot periodicity:every 8 seconds
Class-B ping-slot data-rate:2
Class-B ping-slot frequency (Hz) :505300000

Now the problem is that the downlink frequency is not 505300000 as I expected. So the node can not receive the downlink message.

problem
problem3040×1273 170 KB

2

Maybe I have solved the problem, in chirpstack-network-server.toml file, I add three lines

[network_server.network_settings.class_b]
ping_slot_dr=2
ping_slot_frequency=505300000

I think in the webpage I have already set these parameters, why it is still needed to be set in the toml file again?