learning AT command

Dependencies:   mbed

Revision:
0:170af1345552
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Jun 13 01:22:14 2017 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/mbed_official/code/mbed/builds/0f02307a0877
\ No newline at end of file