| Message | Description |
| TCR = (level, RNL) | is a tree construction request (TCR) message that a server broadcasts at the intervals of TCRInt during initialization period and level indicates the tree level of the node that broadcasts this message. |
| RR(x) = (x,P(x),PF(x)) | is the registration request (RR) message that node x sends to its parent P(x) to register with a server. |
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