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message AEMessage
{
int queryID;
int URI; // this is the unique identifer of the AE, sending the message
string feature_type; // this is the feature type of the resource we are looking for; in this version of protocol
// we can just query one feature type per QUERY
int data; // this is the value concerning the resource we are looking for; Actually used in REGISTRATION.
// TO DO it will be used in UPDATE, PUT, GET, REPLY.
int op_code; // this can be
// REGISTRATION (when AE register to CSE), value =0
// UPDATE (when AE update every x minutes the CSE about the update in its value in local Database); value =1
// CANCELLATION (when AE wants to cancel the Resource inside CSE local Database) value =2
// QUERY (when AE wants to ask for resource), value =3
// PUT (CSE to AE: CSE gives some directive to the corresponding AE) value =4
// GET (CSE to AE: CSE ask some value from the corresponding AE) value =5
// REPLY (AE to CSE: AE reply to the CSE with a value normally in data) value =6
// RESPONSE (AE to CSE: AE reply to the CSE with a value normally in data) value =7
// NOTIFY between CSE to notify modifcations in route tables value =8
int maxHop; // used for a discovery query. Number of hops for the search
}