SIM800L works with AT command on CoolTerm.

Dependencies:   mbed BufferedSerial SoftSerial

Revision:
0:b98b6cf2edfe
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BufferedSerial.lib	Fri Jan 31 20:55:08 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/sam_grove/code/BufferedSerial/#7e5e866edd3d