arjanvanb thank you for your time.
It’s true about the 17 bytes size, but the node is actually sending a 32 bytes payload (for text) plus LoRa data.
Sorry for the terminal screen, here goes the text (from a similar situation):
SX1276 detected, starting.
Gateway ID: b8:27:eb:ff:ff:33:87:ea
Listening at SF7 on 868.100000 Mhz.
------------------
stat update: {"stat":{"time":"2018-03-07 15:07:08 GMT","lati":0.00000,"long":0.00000,"alti":0,"rxnb":0,"rxok":0,"rxfw":0,"ackr":0.0,"dwnb":0,"txnb":0,"pfrm":"Single Channel Gateway","mail":"","desc":""}}
stat update: {"stat":{"time":"2018-03-07 15:07:38 GMT","lati":0.00000,"long":0.00000,"alti":0,"rxnb":0,"rxok":0,"rxfw":0,"ackr":0.0,"dwnb":0,"txnb":0,"pfrm":"Single Channel Gateway","mail":"","desc":""}}
…(continues for some minutes)…
Packet RSSI: -109, RSSI: -111, SNR: -11, Length: 70
rxpk update: {"rxpk":[{"tmst":1291520413,"chan":0,"rfch":0,"freq":868.100000,"stat":1,"modu":"LORA","datr":"SF7BW125","codr":"4/5","lsnr":-11,"rssi":-109,"size":70,"data":"1F/EY3ii6AgSJVdbmfM8CBfpAjio+BDz9/ZSHYnF7kZj8JRm0a3upLCLhDRnPx2MMI809OVW48YfpDnpCzXURpqkV1vUFA=="}]}
…(and again continues for some minutes with:)…
stat update: {"stat":{"time":"2018-03-07 15:35:08 GMT","lati":0.00000,"long":0.00000,"alti":0,"rxnb":1,"rxok":1,"rxfw":0,"ackr":0.0,"dwnb":0,"txnb":0,"pfrm":"Single Channel Gateway","mail":"","desc":""}}