Merge pull request #40 from iotaledger/kwek20-patch-2

Updated C bindings instructions

Author: Brord van Wierst

bindings/c/README.md

@@ -2,12 +2,21 @@
 
 ## Instructions
 
-Change `src/constants.rs` to your preferred node and settings. (default to localhost)
+Check out `CMakeLists.txt` and change the 3 options to your preference:
+
+- `NO_STD`: Enable no_std build, without iota_client (when ON, `SYNC_CLIENT` isnt supported)
+- `SYNC_CLIENT`: Enable sync transport via iota_client, otherwise it's going to be Bucket which can only be used for tests
+- `STATIC`: Build static library when ON, otherwise dynamic library
 
 Edit your author and subscriber seeds in `main.c`
 
-run `./make` in this folder
+run `cmake .` in this folder
+
+Then run `make` to build the rust code.
 
-Then run `cargo build --target-dir ./target` to build the rust code.
+A binary will be generated which you can run depending on your STATIC setting
+- ON:  `iota_streams_c_static`
+- OFF: `libiota_streams_c.so`(Unix), `iota_streams_c.dll`(Windows) and the executable `iota_streams_c`
 
-A binary will be generated which you can run in `./target/streams`
+You can then run the static build or the dynamic executable. Keep in mind that by default the code points to a node on `http://localhost:14265`.
+If this node doesnt exist, we will exit with an error immediately.