Update.

coupler/opc-ua-server/Readme.md

@@ -18,4 +18,8 @@ $ cp ~/open62541/build/open62541.* ~/osie/coupler/opc-ua-server/
 
 ### Building your OPC UA server (Cross compilation to ARM architecture from Ubuntu)
 
-$ arm-linux-gnueabihf-gcc open62541.c server.c -o server
\ No newline at end of file
+$ arm-linux-gnueabihf-gcc open62541.c server.c -o server
+
+### If one wants to run coupler on a x86 platform then one needs to expose in current environment
+
+$ export I2C_VIRTUAL_MODE=1