DRAGINO - Ldds04

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/* * LDDS04 * Payload total 11 bytes * value -> BAT&InterruptorFlag (unit V) - Size(bytes) = 2 * Distance sensor 1 - Size(bytes) = 2 * Distance sensor 2 - Size(bytes) = 2 * Distance sensor 3 - Size(bytes) = 2 * Distance sensor 4 - Size(bytes) = 2 * Message Type- Size(bytes) = 1 */ function Decoder(bytes) { // Decode an uplink message from a buffer // (array) of bytes to an object of fields. let value = ((bytes[0] << 8) | bytes[1]) & 0x3fff; const batV = value / 1000; const exti_trigger = bytes[0] & 0x80 ? "TRUE" : "FALSE"; value = (bytes[2] << 8) | bytes[3]; const distance_cm1 = value / 10; value = (bytes[4] << 8) | bytes[5]; const distance_cm2 = value / 10; value = (bytes[6] << 8) | bytes[7]; const distance_cm3 = value / 10; value = (bytes[8] << 8) | bytes[9]; const distance_cm4 = value / 10; const mes_type = bytes[10]; if (bytes[0] !== 0x03 && bytes[10] !== 0x02) { return [ { variable: "bat_v", value: batV, unit: "v" }, { variable: "exti_trigger", value: exti_trigger }, { variable: "distance1_cm", value: distance_cm1, unit: "cm" }, { variable: "distance2_cm", value: distance_cm2, unit: "cm" }, { variable: "distance3_cm", value: distance_cm3, unit: "cm" }, { variable: "distance4_cm", value: distance_cm4, unit: "cm" }, { variable: "mes_type", value: mes_type }, ]; } } const payload_raw = payload.find((x) => x.variable === "payload_raw" || x.variable === "payload" || x.variable === "data"); if (payload_raw) { try { // Convert the data from Hex to Javascript Buffer. const buffer = Buffer.from(payload_raw.value, "hex"); const serie = new Date().getTime(); const payload_aux = Decoder(buffer); payload = payload.concat(payload_aux.map((x) => ({ ...x, serie }))); } catch (e) { // Print the error to the Live Inspector. console.error(e); // Return the variable parse_error for debugging. payload = [{ variable: "parse_error", value: e.message }]; } }