Feature request: ProbeRequest protocol

[happytm]

Thank you for your LoRaNow Code. I have been trying to implement low power network devices without using rather expensive Lora modules. I think lora devices are the only low power solution for long range communication but if you need small range of few meters like home environment my code is suitable without complexity of extra lora hardware. Please look at my code and see if you an add it as an option to your code. Code is below :

https://github.com/happytm/BatteryNode

Thanks.