We have an IC880a SPI connected to an RPI3, antenna 8dBi. As a client we are using a Multi-Tech mDot.
During some tests we could not understand the following: we send one message (a confirmed uplink) but from time to time the gateway sees a single message multiple times:
{“rxpk”: [
{“tmst”:873783916, “time”:“2017-01-22T15:17:15.799187Z”, “chan”:2, “rfch”:1, “freq”:868.500000,
“stat”:1, “modu”:“LORA”, “datr”:“SF9BW125”, “codr”:“4/5”, “lsnr”:-9.5, “rssi”:-101, “size”:15, “data”:“gAOcIgcAKgABnIYky4ti”},
{“tmst”:873783916, “time”:“2017-01-22T15:17:15.799187Z”, "chan":6, “rfch”:0, “freq”:867.700000,
“stat”:1, “modu”:“LORA”, “datr”:“SF9BW125”, “codr”:“4/5”, “lsnr”:-6.5, “rssi”:-101, “size”:15, “data”:“gAOcIgcAKgABnIYky4ti”},
{“tmst”:873783924, “time”:“2017-01-22T15:17:15.799187Z”, "chan":0, “rfch”:1, “freq”:868.100000,
“stat”:1, “modu”:“LORA”, “datr”:“SF9BW125”, “codr”:“4/5”, “lsnr”:12.0, “rssi”:-45, “size”:15, “data”:“gAOcIgcAKgABnIYky4ti”}
]}
Some of them have a high RSSI value.
Used software:
*** Poly Packet Forwarder for Lora Gateway ***
Version: 2.1.0
*** Lora concentrator HAL library version info ***
Version: 3.1.0; Options: native;
Any ideas guys?
