From owner-freebsd-bluetooth@freebsd.org Sun Jul 9 03:22:58 2017 Return-Path: Delivered-To: freebsd-bluetooth@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B5E1DDAA0F7 for ; Sun, 9 Jul 2017 03:22:58 +0000 (UTC) (envelope-from maksim.yevmenkin@gmail.com) Received: from mail-wr0-x235.google.com (mail-wr0-x235.google.com [IPv6:2a00:1450:400c:c0c::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BCC275DC3 for ; Sun, 9 Jul 2017 03:22:58 +0000 (UTC) (envelope-from maksim.yevmenkin@gmail.com) Received: by mail-wr0-x235.google.com with SMTP id c11so94893482wrc.3 for ; Sat, 08 Jul 2017 20:22:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=lAeYH0VKs8i2bckirSy38i6CpLGbWz1fIsIkRp1yXEE=; b=nJ5uJyMmQAfkuTYQvfw2hVHgZo2jOTR9B4AsVPGN6fuskeHkTTulUuEvCFqaKq8UQZ bNKPRihB9QmHbdOF0IXi6KKuVPunU0Hjy6W530MGX9YYYooySUE4zhGzj26FrHLlsWaF q7d4PjxSEN7rr+TIW6k7e2GQz5iC2li3fGZuLpZweU5sveD1jaxRAuazzEmFEMWJPfFN z0fZMQd/jilPSXPz6uw52CiFtUAB6zUGKfqu74WbN4+KV6bEABaP01JdLX6FJwgM1fu3 sdEQdHwQefKO5T5JJ34H4EAo4Aed6rzQZzH4kRxqm2NXV73z93cYSSMtrycFQHaljy/C heDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=lAeYH0VKs8i2bckirSy38i6CpLGbWz1fIsIkRp1yXEE=; b=MHf38U1s0ptoHEmLRNfwpRlkMG/TYgoUcSd0Pbvu2dPfLEiFa6Xn8ZovKMqQXqGLFW enrzqbSbvu3s9O7v+JmhU3dVui/Obag90YsE5AAkt2e0d9AXYBQFXP90Z8trbnIZtkpZ uh0yC44D3xw95TdJuVbon9VaN6iAIG6ONbAOzhMo24kelWc+0bcQjzB1crs5OK77TIF+ PUufWxWkiDedTZQ526MYV+JdrRU3qPI9+6CxDzQohkOjg2QKmTIEcxZSthzXrE8QdPqv 43f3O8YH6LvC/97wIGF4VRWPXd1AVxhGFFe14HpHvq+ELJjlslL6g6whtiARAWyhyKgy PvOw== X-Gm-Message-State: AIVw113V6hfNP/V4egpeL2DxScgXk6GwYzCH7iiD55d2THRcUWIm4Qxj DMrDBS1/jv9v+RrPFgYh53Tr1IEZ8g== X-Received: by 10.80.155.19 with SMTP id o19mr7073163edi.27.1499570576870; Sat, 08 Jul 2017 20:22:56 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.140.35 with HTTP; Sat, 8 Jul 2017 20:22:56 -0700 (PDT) In-Reply-To: References: <085c77b2-9f40-5a1f-0b49-86a24e561fce@aldan.algebra.com> From: Maksim Yevmenkin Date: Sat, 8 Jul 2017 20:22:56 -0700 Message-ID: Subject: Re: How to listen quietly for other Bluetooth devices? To: "Mikhail T." Cc: "Mikhail T." , "freebsd-bluetooth@freebsd.org" Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-bluetooth@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Using Bluetooth in FreeBSD environments List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 09 Jul 2017 03:22:58 -0000 > Doesn't "inquiry" imply activity? yes, device will go into "inquiry scan" > I'd like the computer to listen passively... > I assume, if a phone nearby is communicating with something (like headphones), > other Bluetooth devices hear it - even if they typically ignore it. Is that a valid assumption? well, yes and no. bluetooth is basically TDMA (time division multiple access). what it means is that each device is assigned time slot in which it can communicate. so, device will effectively "not listen/talk" unless its in the assigned time slot. i'm simplifying things a lot here, but, i hope you get the general idea > Can a Bluetooth dongle be placed into some sort of "promiscuous" mode instead? not that i know of. bluetooth scanners exist (as completely separate units), but they are (or at least used to be) expensive. those are used to grab over-the-air transmissions and decode them. i'm not aware (not have i ever seen) of-the-shelf bluetooth dongle that is capable of going into "promiscuous" mode. thanks! max