Can't make Mavlink instance 1 work on Telem2 or 3

I successfully linked Telem1 with my RPI through serial0 or ttyUSB0(both worked). Now I want to start a new connection between Telem2/3 and ttyUSB0(or serial0), so that I can get two connections at the same time. However, I can’t get any data from Telem2/3 (mavlink instance 1). Does anyone know the reason? THANKS!

The MAVSDK example returns like “waiting for system time out”

1 1 MAV_0_CONFIG 101 6
1 1 MAV_0_FLOW_CTRL 2 6
1 1 MAV_0_FORWARD 1 6
1 1 MAV_0_MODE 0 6
1 1 MAV_0_RADIO_CTL 1 6
1 1 MAV_0_RATE 0 6
1 1 MAV_1_CONFIG 102 6
1 1 MAV_1_FLOW_CTRL 2 6
1 1 MAV_1_FORWARD 0 6
1 1 MAV_1_MODE 2 6
1 1 MAV_1_RADIO_CTL 1 6
1 1 MAV_1_RATE 0 6
1 1 MAV_2_BROADCAST 0 6
1 1 MAV_2_CONFIG 0 6
1 1 MAV_2_MODE 0 6
1 1 MAV_2_RADIO_CTL 0 6
1 1 MAV_2_RATE 100000 6
1 1 MAV_2_REMOTE_PRT 14550 6
1 1 MAV_2_UDP_PRT 14550 6
1 1 MAV_COMP_ID 1 6
1 1 MAV_FWDEXTSP 1 6
1 1 MAV_HASH_CHK_EN 1 6
1 1 MAV_HB_FORW_EN 1 6
1 1 MAV_PROTO_VER 0 6
1 1 MAV_RADIO_TOUT 5 6
1 1 MAV_SIK_RADIO_ID 0 6
1 1 MAV_SYS_ID 1 6
1 1 MAV_TYPE 13 6
1 1 MAV_USEHILGPS 0 6

What baudrate are you using? Which version of PX4? Have you disabled flow control (try OFF instead of AUTO).

It worked after turning OFF the flow control of both instance0 and 1. Thank you Julian! You are so nice!

I was using the baudrate of 115200 (both telem1 and 2)
the PX4 version is 1.14.0
the frame is Generic Hexarotor x geometry
The autopilot is Holybro Pixhawk 6X

Thank you Julian and the Dev Team!

Right, so that’s a catch with v1.14.0. It’s fixed with v1.14.1 and later.