Convert license tags to SPDX Also clarifies provenance of code in `apps/fdtgen/fdt_utils.c` Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
picotcp_tcp_echo: Remove unused definition Can safely remove duplicated definition
picotcp_tcp_echo: Create app based on picoserver This app is similar to picoserver but doesn't have a listener component. It has an echo client that echoes TCP messages received on port 1234