Download nRF51 SDK from and use the SDK zip installer. Recommend using the latest SDK even though v.6.1.0 was used in this blog. Difference to be aware of is that the folder structure and makefiles has changed. - The project makefiles became standalone in SDK v.7 and later, meaning that they do not depend on the makefile.common anymore. Debugging is enabled in the new makefiles by commenting out the #CFLAGS += -flto -fno-builtin (link time optimization) in addition to setting -O0 and -g3 to the compiler options.
Postbox 6.1.0
2ff7e9595c
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