adds getMACAddress() like getIPAddress(). Initializes in constructor.

Dependencies:   Socket lwip-eth lwip-sys lwip

Fork of EthernetInterface by Jonathon Fletcher

Revision:
14:cec293071eed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwip.lib	Mon Jul 23 11:53:01 2012 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/lwip/#00bf89892c76