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JaapBraam / LoRaWanGateway

A LoRaWan Gateway in LUA
MIT License
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Different freq detected 902.2999xx instead of 902.3xxx (channel 0, subband 0) #5

Closed shmrymbd closed 8 years ago

shmrymbd commented 8 years ago

My node are using LMIC code and transmitting to ESP gateway.. Setup US-915 channel sub band 0, 0-7 and enable channel 0 only. The freq received is different compare what I got if using Raspi Single packet gateway source. Below are the rcd packet;

rxpk.017f1000600194ffff0b94cb.message.{"rxpk":[{"rssi":-105,"stat":1,"modu":"LORA","rfch":0,"tmst":61998373,"datr":"SF10BW125","lsnr":-2,"time":"2016-08-20T02:28:08.167523Z","codr":"4/5","data":"QMSAzwYAVAEOGm77NG9CjwcPdOph","freq":902.299987,"chan":0,"size":21}]}.length.238

JaapBraam commented 8 years ago

The frequency is converted from an integer value to a floating point frequency in Mhz. The lora chip cannot be configured listen on exactly 902.3Mhz. The things network servers will round it up to 902.3Mhz...

shmrymbd commented 8 years ago

I am using loraserver. It seem the packet rejected by the loraserver https://github.com/brocaar/loraserver

kragupat commented 7 years ago

@shmrymbd Looks like you have this gateway running in US 915Mhz, Is all that is required to do this is change the local CHN array defnintion to

local CHN={} CHN[0]=chan(902300000,"LoRa",MC1.BW125) CHN[1]=chan(902500000,"LoRa",MC1.BW125) CHN[2]=chan(902700000,"LoRa",MC1.BW125) CHN[3]=chan(902900000,"LoRa",MC1.BW125) CHN[4]=chan(903100000,"LoRa",MC1.BW125) CHN[5]=chan(903300000,"LoRa",MC1.BW125) CHN[6]=chan(903500000,"LoRa",MC1.BW125) CHN[7]=chan(903700000,"LoRa",MC1.BW125) CHN[8]=chan(903900000,"LoRa",MC1.BW250) CHN[9]=chan(904100000,"FSK" ,MC1.BW150)

or do I have to do something more.