g_message_data_reply_buffer buffer overflow

Just thought I'd share one of the problem I encountered.

I was having a Hard Fault on my device whenever I try the Get_Attribute_All on 0xF6 Ethernet Link with EtherNet/IP Tools from Molex. Turns out that the ` g_message_data_reply_buffer ` used by `NotifyMessageRouter()` was overflowing. It was sized 100 by default from the sample opener_user_conf.h on MINGW.

Increasing the buffer size fixed the hard fault problem. I think it'd be great if we knew the minimum buffer size needed.