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Trickle is a transmission scheduling algorithm developed for wireless sensor networks. The Trickle algorithm determines whether (and when) a message can be transmitted. Therefore, Trickle operation is critical for performance parameters such as energy consumption and available bandwidth. This letter presents an analytical model for the message count of a static Trickle-based network under steady state conditions, as a function of a parameter called the redundancy constant and the average node degree. The model presented is validated by simulation results.