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Physical-layer Key generation for wireless networks has been considered a promising alternative to traditional techniques based on pseudorandom number generators. This work evaluates key generation in a Long Range Wide Area (LoRaWAN) based on Received Signal Strength Indicator (RSSI) values, measured during the reception of LoRaWAN packets. This work uses Discrete Cosine Transform (DCT) and Principal Component Analysis (PCA) to increase reciprocity in the measurements. The usage of PCA for this purpose with RSSI values is a novelty of this work. Simulation results indicate that PCA can produce higher correlation values and lower key disagreement rate (KDR) than DCT.