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configuration files:
 - dataflows.m 
	setting of the parameters of data flows. Each data flow is defined by the structure with the following parameters: source, sink, deadline, sample_period, sample_size and ack

 - parameters.m
	setting of the IEEE 802.15.4 constants and variables

 - topology.m
	description of the cluster-tree topology (interference and parent-child relation between the nodes)

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The TDCS tool is running using zigbee_tree.m file with the following inputs parameters:
 - no parameters (i.e. zigbee_tree()). The data flows and topology definitions are loaded from the dataflow.m and topology.m configuration files.
 - 3 parameters (i.e. zigbee_tree(CTT, I, DF)), where CTT is adjacent matrix describing the cluster-tree topology, I is collision matrix ad DF is the structure describing the data flows
So you can for example issue this sequence of matlab commands (this sequence equivalent to: zigbee_tree()):
[DF]=dataflows()
[CTT,no_routers,I] = topology()
zigbee_tree(CTT, I, DF)

At the beginning of the zigbee_tree.m files you can define the solving tool using the key word "GLPK" or "CPLEX".