LSN50 ABP failed connection

Hello, I don’t understand why and how to correct the situation.
I use a DRAGINO LG01 gateway and try to connect a LSN50 from Dragino.
The LSN50 work very well with the objenious OTAA Lora network.
Now I try to use the LSN50 with the LG01 gateway on TTN with ABP.

My gateway receive a join request (why in ABP?). In this join request, DEV EUI is understand, App EUI is understand. Physical payload is decoded. And event data is attached below. After theLSN50 make Uplink, but nothing is received by the gateway.

{
“gw_id”: “eui-a84041186458ffff”,
“payload”: “AMMuAdB+1bNwFDhgEShCESjjx34H+BI=”,
“dev_eui”: “2811422811603814”,
“lora”: {
“spreading_factor”: 7,
“bandwidth”: 125,
“air_time”: 61696000
},
“coding_rate”: “4/5”,
“timestamp”: “2018-10-05T13:53:58.343Z”,
“rssi”: -111,
“snr”: 9,
“app_eui”: “70B3D57ED0012EC3”,
“frequency”: 868100000000000
}

I suspect an error on the LSN50 side. but which?
In parallèle a TTN Lora NODE works very well in ABP with the Dragino LG01 gateway.

Who could me help?

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