TTN Smart Sensor (Parametric)

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/** * RDR Payload Decoders * * THIS SOFTWARE IS PROVIDED BY PARAMETRIC GMBH AND ITS CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ function app_payload_r0_decoder(bytes) { var obj = {}; // check for Parametric RDR R0 Payload if (bytes[0] == 0xbe && bytes[1] == 0x05 && bytes[2] === 0x00) { // Uplink Timestamp (Linux Epoche) var timestampUL = bytes[3] << 24; timestampUL += bytes[4] << 16; timestampUL += bytes[5] << 8; timestampUL += bytes[6]; var ULInMs = new Date(timestampUL * 1000).getTime(); var nowInMs = new Date().getTime(); var diffUL = nowInMs - ULInMs; var actualULTIME = new Date(ULInMs + diffUL); obj.ULTIME = actualULTIME.toISOString(); // Number of scan records obj.RECCNT = bytes[7]; // Number of records still in device buffer obj.BUFF = bytes[8]; obj.Records = []; // scan records var nextRecPos = 9; // scan position for (var i = 0; i < obj.RECCNT; i++) { var rec = {}; // scan timestamp var timestampSCAN = bytes[nextRecPos] << 24; timestampSCAN += bytes[nextRecPos + 1] << 16; timestampSCAN += bytes[nextRecPos + 2] << 8; timestampSCAN += bytes[nextRecPos + 3]; var diff = ULInMs - new Date(timestampSCAN * 1000).getTime(); var actualSCANTIME = new Date(nowInMs - diff); rec.SCANTIME = actualSCANTIME.toISOString(); // nfc serial rec.SERIAL = bytes.slice(nextRecPos + 4, nextRecPos + 12); rec.LEN = bytes[nextRecPos + 12]; rec.DATA = bytes.slice(nextRecPos + 12, nextRecPos + 13 + rec.LEN); obj.Records.push(rec); nextRecPos = nextRecPos + 12 + rec.LEN + 2; } } return obj; } function bin16dec(bin) { var num = bin & 0xffff; if (0x8000 & num) num = -(0x010000 - num); return num; } function hexToBytes(hex) { hex = hex.replace(/\s+/g, ''); hex = hex.toLowerCase(); for (var bytes = [], c = 0; c < hex.length; c += 2) bytes.push(parseInt(hex.substr(c, 2), 16)); return bytes; } function decodeUplink(input) { var bytes = input.bytes; var port = input.fPort; var obj = {}; if (bytes[0] == 0xbe && bytes[1] == 0x05 && port == 5) { if (bytes[2] === 0x00) { // it's the application payload v0 obj = app_payload_r0_decoder(bytes, port); } } else if (port != 5) { obj.error = 'ERROR: Wrong port! RDR devices are using port 5 for application payloads.'; } else { obj.error = 'ERROR: RDR application payload R0 should start with be0500.. '; } return { data: obj, }; } //Example Payload: BE05005F9BEB2C01005F9BAB2C9EAF5126002302E0010C