Hy Tim,
yes, that´s what we are trying. But first of all: how much loss has to be expected under perfect conditions, 1%, 10%, 30%?!?
Referring to your advice I started a test: Switched off all nodes except one here with an RSSI of -65dB, that sends one message every minute. So i coud see the traffic of the gateway, of the application and of node-red, that receives the messages.
So far, all messages displayd in the gateway traffic have been forwared correctly. But not all sent messages are shown in the gateway traffic.
Here is an example from the gateway log. This was one packet that was not forwarded. We see that the gateway received the message, but TTN did not get the data. This is an Kerlink iFemtocell running SPF:
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: INFO: Received pkt from mote: 26012395 (fcnt=16298)
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: JSON up: {"rxpk":[{"tmst":552221707,"chan":1,"rfch":0,"freq":867.300000,"stat":1,"modu":"LORA","datr":"SF7BW125","codr":"4/5","lsnr":9.0,"rssi":-63,"size":21,"data":"QJUjASaAqj8Bk616AQ+63HXICLhD"}]}
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: ##### 2019-09-16 15:45:07 GMT #####
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: ### [UPSTREAM] ###
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: # RF packets received by concentrator: 1
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: # CRC_OK: 100.00%, CRC_FAIL: 0.00%, NO_CRC: 0.00%
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: # RF packets forwarded: 1 (21 bytes)
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: # PUSH_DATA datagrams sent: 2 (312 bytes)
Sep 16 15:45:07 klk-wifc-040187 local1.notice spf: # PUSH_DATA acknowledged: 0.00%
We can change the gateway and use a TTN indoor gateway. Here I cannot read the logs, but loss is nearly the same. RSSI is slightly higher (-60dB), but we loose lot´s of traffic anyway.
True, we should use lower frequency, but airtime is only 36 ms and there are no other nodes around.
So it seems pretty clear that losses happen between gateway and TTN, but it is not the Gateway itself.
Might be the reason is our internet connection or the receiver?!? Internet connection here is very stable and fast (above 50MBit) and we had the same issue on other places, so it is unlikely an issue of the connection.
Any suggestion to digg deeper?