C# library to determine direction of movement of BLE device based on two sets of continuous RSSI readings

We have an environment with pairs of Bluetooth receivers (Receiver 1 and Receiver 2) a fixed distance apart i.e. 3m. They detect BLE devices and report back UUID, Major, Minor, RSSI, Measured Power every 1 second. BLE devices pass by the receivers moving either left to right (Towards Receiver 1) or right to left (Towards Received 2). Given a set of RSSI values for each BLE device from each Bluetooth receiver we want to determine which direction the BLE device is travelling in. We also want to determine the time that they were nearest to each of the two receivers (i.e. the time at which the receiver recorded the highest RSSI). Based on the time that they were closest to each of the two receivers approximate the time taken to pass between the two receivers and speed. As RSSI can vary even when stationary; we require some level of filtering to remove outliers/ possibly a moving average. We require a custom C# class, NUnit Test and a C# console app demonstrating the class.