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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
For point-to-point connectivity, you do not need that much power (4W). Directional antennas are sufficient. For areal coverage, you need more power. The question is also what is your expected data rate, and how reliable the connectivity and how large the packet size should be. Regarding reliability: are you thinking of a system that would allow and have retries?