Huy Nguyen / Mbed 2 deprecated SX1276PingPong

Simple example Ping Pong from Semtech, updated new lib

Dependencies:   SX1276Lib mbed

Fork of SX1276PingPong by Semtech

i'm using stm32 nucleo l46rg and stm32 nucleo l073 with sx1276mb1mas.

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