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RPI3 GW poor RSSI on RFM69HW #1077

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@SimoneBnc

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@SimoneBnc

I have tried compiling the development version on my RPI3 with a RFM69HW radio same as the node (pro mini 3.3v) but I am getting -90dbm RSSI on node with 100% tx power and a bunch of NACKs, while just compiling the stable version on the RPI3 makes the node reporting a -70dbm RSSI with 0% tx power. I also tried both stable and development version on node but the result is the same so it is something wrong on the GW side.
GW is compiled as follow: ./configure --my-transport=rfm69 --my-rfm69-frequency=433 --my-is-rfm69hw --my-gateway=ethernet --my-port=5003, I only added #define MY_RFM69_NETWORKID (27) to the mysgw.cpp

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