Passive roaming session error when sNS has no info about EDs

[MarinoMtz]

Hi,

I'm trying to understand why i'm getting some error messages in passive roaming.

I have the following architecture:

I've created two DNS resolvers one on deveui.iot-roam.net and netid.iot-roam.net

1st LNS: netid is 000001 and JoinEUI 0000000000000001
2nd LNS: netid is 000000 and JoinEUI 0000000000000002

The hNS (in this case netid is 000001), has no prior information about the ED, then I:

1. Send a Join Request with JoinEUI 00 00 00 00 00 00 00 02

Then I have the first DNS request:

2. DNS query for 2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.joineui.iot-roam.net
3. DNS answer with the Join Server IP
4. TLS handshake
5. TLS App data with the NetID

Then, since the hNS has no information about this ED, i can see that there is a second DNS Query:
6. DNS query for 000000.netid.iot-roam.net
7. DNS answer with the hNS IP
8. TLS Handshake
9. TLS App data

Here I'm expecting to have this:
10. HomeNSReq / HomeNSAns
11. PRStartReq / JoinReq
9. JoinAns / PRStartAns
10. JoinAccept

But instead I have this from the logs:

On the sNS :

Nov 02 14:17:12 outils.plido.net chirpstack-network-server[1082]: time="2021-11-02T14:17:12.799863844+01:00" level=info msg="uplink/join: resolved joineui to netid" ctx_id=dbd9ff44-5758-441e-9b10-646e0a75ccd5 dev_eui=da03899bc920e487 join_eui=0000000000000002 net_id=000000
Nov 02 14:17:12 outils.plido.net chirpstack-network-server[1082]: time="2021-11-02T14:17:12.812686895+01:00" level=info msg="lorawan/backend: finished backend api call" message_type=PRStartReq protocol_version=1.0 receiver_id=000000 result_code= sender_id=000001 transaction_id=136598966
Nov 02 14:17:12 outils.plido.net chirpstack-network-server[1082]: time="2021-11-02T14:17:12.812846793+01:00" level=error msg="uplink: processing uplink frame error" ctx_id=dbd9ff44-5758-441e-9b10-646e0a75ccd5 error="PRStartReq error: response error, code: , description: "

On the hNS:

nov. 02 13:18:02 vps768800 chirpstack-application-server[4653]: time="2021-11-02T13:18:02.751940573Z" level=info msg="backend/joinserver: sending response" dev_eui=da03899bc920e487 message_type=HomeNSAns receiver_id=000001 result_code=Success sender_id=0000000000000002 transaction_id=1140153905
nov. 02 13:18:02 vps768800 chirpstack-application-server[4653]: time="2021-11-02T13:18:02.764110007Z" level=info msg="backend/joinserver: request received" message_type=PRStartReq receiver_id=000000 sender_id=000001 transaction_id=3904647844
nov. 02 13:18:02 vps768800 chirpstack-application-server[4653]: time="2021-11-02T13:18:02.764142392Z" level=error msg="backend/joinserver: error handling request" error="invalid MessageType: PRStartReq"

As application server I have in both sides the 3.17.3 version and for the NS I have 3.15.3

Am I doing something wrong?

Sorry if this is not the right place to ask

BR
Ivan
IMT Atlantique