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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.
@fanoush
Are you using active or passive scan (options.active = 1)? With active scan for every device found it tries to request scan response from it. So when doing this I am guessing it may miss other device advertising at the same time? The scan response request/response is done on same channel as the advertising packet received. And I think it is done immediately after receiving the packet since the advertising device waits only short window for scan response request after sending advertising packet. Anyway, changing scan to passive could IMO help to just listen for the whole window instead of transmitting into the same channel for every device that is found possibly increasing noise and missing something.
BTW just found interesting document about active scanning and its issues "Anti-Collision Adaptations of BLE Active Scanning for Dense IoT Tracking Applications" https://zaguan.unizar.es/record/75799/files/texto_completo.pdf?version=1