First firmware.

lib/ota.js

@@ -0,0 +1,58 @@
+const assert = require('assert');
+const upgradeFileIdentifier = Buffer.from([0x1E, 0xF1, 0xEE, 0x0B]);
+
+function parseSubElement(buffer, position) {
+    const tagID = buffer.readUInt16LE(position);
+    const length = buffer.readUInt32LE(position + 2);
+    const data = buffer.slice(position + 6, position + 6 + length);
+    return {tagID, length, data};
+}
+
+function parseImage(buffer) {
+    const header = {
+        otaUpgradeFileIdentifier: buffer.subarray(0, 4),
+        otaHeaderVersion: buffer.readUInt16LE(4),
+        otaHeaderLength: buffer.readUInt16LE(6),
+        otaHeaderFieldControl: buffer.readUInt16LE(8),
+        manufacturerCode: buffer.readUInt16LE(10),
+        imageType: buffer.readUInt16LE(12),
+        fileVersion: buffer.readUInt32LE(14),
+        zigbeeStackVersion: buffer.readUInt16LE(18),
+        otaHeaderString: buffer.toString('utf8', 20, 52),
+        totalImageSize: buffer.readUInt32LE(52),
+    };
+    let headerPos = 56;
+    if (header.otaHeaderFieldControl & 1) {
+        header.securityCredentialVersion = buffer.readUInt8(headerPos);
+        headerPos += 1;
+    }
+    if (header.otaHeaderFieldControl & 2) {
+        header.upgradeFileDestination = buffer.subarray(headerPos, headerPos + 8);
+        headerPos += 8;
+    }
+    if (header.otaHeaderFieldControl & 4) {
+        header.minimumHardwareVersion = buffer.readUInt16LE(headerPos);
+        headerPos += 2;
+        header.maximumHardwareVersion = buffer.readUInt16LE(headerPos);
+        headerPos += 2;
+    }
+
+    const raw = buffer.slice(0, header.totalImageSize);
+
+    assert(Buffer.compare(header.otaUpgradeFileIdentifier, upgradeFileIdentifier) === 0, 'Not an OTA file');
+
+    let position = header.otaHeaderLength;
+    const elements = [];
+    while (position < header.totalImageSize) {
+        const element = parseSubElement(buffer, position);
+        elements.push(element);
+        position += element.data.length + 6;
+    }
+
+    assert(position === header.totalImageSize, 'Size mismatch');
+    return {header, elements, raw};
+}
+
+module.exports = {
+    parseImage
+};