Algorithm 1: Post emergency messages
Input: mi, ei, k, Ek,Mk,
mi:	the size of emergency the message needed to be posted
ei:	the approximated energy consumption of receiving the emergency message.
k:	the number of Tibbo nearby victim i is k.
Ek:	the remaining energy capacity of the k-th Tibbo
Mk:	the remaining memory capacity of the k-th Tibbo
S:	the selected Tibbo board
1:	Procedure Post
2:	S = Null;
3:	for j = 1 to k do
4:	if (S == Null) AND (Ej > ei ) AND (Mj > mi ) then
5:	S = j;
6:	else if (S! = Null) AND (Ej > Es ) AND (Mj > mi ) then
7:	S = j;
8:	end if
9:	end for
10:	if S is not Null
11:	Connect to Tibbo board S;
12:	Post the emergency message on S;
13:	end if