No downlink for MQTT command

Hello,
I 'm french, i use a pico gateway of Néméus
I want to downlink
The join with the Device is OK 14h08
The message uplink Device to Server is ok 14h13
I send whith Mosquitto this request:
envoi requete mosquitto 14h11
mosquitto_pub -h 192.168.1.152 -d -t “application/1/device/0004a30b002405a5/tx” -f envoi.json

fichier envoi.json
{
“reference”:“test”,
“freq”:869.525,
“confirmed”:true,
“fPort”:3,
“data”:“q1A=”
}

but no no downlink?
the file log for chirpstack-application-server
mai 23 14:09:51 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:09:51+02:00” level=info msg=“backend/joinserver: request received” message_type=JoinReq receiver_id=70b3d57ed001af8f sender_id=000000 transaction_id=330517335
mai 23 14:09:51 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:09:51+02:00” level=info msg=“device-keys updated” ctx_id="" dev_eui=0004a30b002405a5
mai 23 14:09:51 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:09:51+02:00” level=info msg=“backend/joinserver: sending response” message_type=JoinAns receiver_id=000000 result_code=Success sender_id=70b3d57ed001af8f transaction_id=330517335

mai 23 14:11:15 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:11:15+02:00” level=info msg=“integration/mqtt: data-down payload received” topic=application/1/device/0004a30b002405a5/tx
mai 23 14:11:15 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:11:15+02:00” level=info msg=“finished client unary call” ctx_id="" grpc.code=OK grpc.ctx_id=cb772498-8263-4cb1-8860-7213105d8c0a grpc.duration=1.108715ms grpc.method=GetNextDownlinkFCntForDevEUI grpc.service=ns.NetworkServerService span.kind=client system=grpc
mai 23 14:11:15 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:11:15+02:00” level=info msg=“finished client unary call” ctx_id=4c6dcded-0b16-43d0-8dcc-84ce1ec65f7b error=“rpc error: code = InvalidArgument desc = device security-context out of sync” grpc.code=InvalidArgument grpc.ctx_id=0448da74-a875-4218-819c-f60aa06d60ea grpc.duration=1.70661ms grpc.method=CreateDeviceQueueItem grpc.service=ns.NetworkServerService span.kind=client system=grpc
mai 23 14:11:15 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:11:15+02:00” level=error msg=“handle data-down payload error: enqueue downlink device-queue item error: create device-queue item error: rpc error: code = InvalidArgument desc = device security-context out of sync” application_id=1 dev_eui=0004a30b002405a5

mai 23 14:13:07 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:13:07+02:00” level=info msg=“device last-seen and dr updated” ctx_id=788ddb6c-e0b1-4aa6-a5b7-3dc089c8eb20 dev_eui=0004a30b002405a5
mai 23 14:13:07 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:13:07+02:00” level=info msg=“device activation updated” ctx_id=788ddb6c-e0b1-4aa6-a5b7-3dc089c8eb20 dev_addr=004c2ca7 dev_eui=0004a30b002405a5
mai 23 14:13:07 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:13:07+02:00” level=info msg=“finished unary call with code OK” ctx_id=788ddb6c-e0b1-4aa6-a5b7-3dc089c8eb20 grpc.code=OK grpc.method=HandleUplinkData grpc.request.deadline=“2020-05-23T14:13:08+02:00” grpc.service=as.ApplicationServerService grpc.start_time=“2020-05-23T14:13:07+02:00” grpc.time_ms=21.935 peer.address=“127.0.0.1:47678” span.kind=server system=grpc
mai 23 14:13:07 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:13:07+02:00” level=info msg=“integration/mqtt: publishing message” ctx_id=788ddb6c-e0b1-4aa6-a5b7-3dc089c8eb20 qos=0 topic=application/1/device/0004a30b002405a5/join
mai 23 14:13:07 btssn-VirtualBox chirpstack-application-server[705]: time=“2020-05-23T14:13:07+02:00” level=info msg=“integration/mqtt: publishing message” ctx_id=788ddb6c-e0b1-4aa6-a5b7-3dc089c8eb20 qos=0 topic=application/1/device/0004a30b002405a5/rx

log: chirpstack-gateway-bridge

mai 23 14:09:51 btssn-VirtualBox chirpstack-gateway-bridge[718]: time=“2020-05-23T14:09:51+02:00” level=info msg=“integration/mqtt: publishing event” event=up qos=0 topic=gateway/d88039e0dd130000/event/up uplink_id=9849b791-acf0-4af7-9e11-e16920f98164
mai 23 14:09:51 btssn-VirtualBox chirpstack-gateway-bridge[718]: time=“2020-05-23T14:09:51+02:00” level=info msg=“integration/mqtt: downlink frame received” downlink_id=d963afb5-7e61-4d1e-a102-a765ccd065ff gateway_id=d88039e0dd130000

mai 23 14:13:07 btssn-VirtualBox chirpstack-gateway-bridge[718]: time=“2020-05-23T14:13:07+02:00” level=info msg=“integration/mqtt: publishing event” event=up qos=0 topic=gateway/d88039e0dd130000/event/up uplink_id=770bc192-505d-450f-9283-3aa9420a90dd
mai 23 14:13:08 btssn-VirtualBox chirpstack-gateway-bridge[718]: time=“2020-05-23T14:13:08+02:00” level=info msg=“integration/mqtt: downlink frame received” downlink_id=0b643ba7-12b2-4cf7-99ea-e725040c6d1c gateway_id=d88039e0dd130000

why there are not downlink?
Thank you for advance.

Michel