explain a bit why Lorawan wasn't used, and clarify compiler issue..

README.md

@@ -12,7 +12,9 @@ While investigating this, the LoraWAN protocol was investigated, but
 after looking at the code complexity and other operational requirements,
 if was decided that for this project, it was safer to target a direct
 Node to Node style communication system.  This would allow the
-implementation to be more simple, and security to be built in.  It
+implementation to be more simple, and security to be built in (LoRaWAN
+does have a crypto layer, BUT, trusting/auditing it and any library that
+implements it would be a larger task than I want to undertake).  It
 could also be used for other projects that need security.
 
 One of the other requirements is that the code be 100% open sourced,
@@ -29,10 +31,10 @@ make on the BSDs, originally called pmake, but also available as bsdmake
 for MacOSX, and likely other operating systems as well.
 
 It also depends upon ARM's [GNU Arm Embedded
-Toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm)
-which uses gcc as the compiler.  It would be good to get it to
+Toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm),
+which uses gcc as the compiler.  It would be good to get it
 cross-compile with clang as well, but that requires finding a libc like
-the nano libc that `nano.specs` in the above toolchain provides.
+the nano libc that is provided by the toolchain.
 
 Once ARM's toolchain is in your path, the following should work:
 ```