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\section{Security, Reliability and Cost}  \section{Security}  \textbf{Zigbee} was designed with security in mind and relies on symmetric-key encryption using 128-bit AES. However, key management is prone to implementation errors and in special circumstances cryptographic key can be sent unencrypted (Cognosec, 2015).   \textbf{LoRa} also relies on 128-bit AES scheme, at the time of writing there are no known vulnerabilities except key mismanagement and device tampering.   \textbf{Bluetooth LE} relies on spread-spectrum security, however it is trivial to recover follow frequency hops rendering BLE insecure (Ryan, 2013).