uri modified. (ARMmbed#1510)

Author: deepakvenugopal

source/6LoWPAN/Thread/thread_extension_constants.h

@@ -59,7 +59,7 @@ typedef struct discovery_additional_info {
 #define THREAD_URI_BBR_BB_ANS_NTF               "b/ba"  //<* Backbone border router
 #define THREAD_URI_BBR_NMKP_REQ                 "c/cjf"  //<* Backbone border router
 
-#define THREAD_URI_TRI_TX_NTF                   ".well-known/thread/c/tx"  //<* Registrar
+#define THREAD_URI_TRI_TX_NTF                   ".well-known/thread/c/txr"  //<* Registrar
 #define THREAD_URI_TRI_RX_NTF                   ".well-known/thread/c/rxr"  //<* Registrar
 
 /** @defgroup Thread 1.2 experimental */