add decoder for RTTrPM packet

src/decoders/motion/rttrpm.ts

@@ -0,0 +1,38 @@
+import { Decoders } from '..';
+import { RTTrPM, Trackable } from '../../models';
+
+export default (bytes: Uint8Array): RTTrPM => {
+  if (bytes.byteLength < 18) {
+    throw new Error('RTTrPM packet must be at least 18 bytes long');
+  }
+  const header = Decoders.RTTrPHeader(bytes.subarray(0, 18));
+
+  if (bytes.byteLength !== header.size) {
+    throw new Error('RTTrPM packet size mismatch');
+  }
+
+  const modules: Trackable[] = [];
+  let packetModuleOffset = 18;
+
+  for (let index = 0; index < header.subModuleCount; index++) {
+    const moduleData = bytes.subarray(packetModuleOffset);
+    const moduleType = moduleData[0];
+    switch (moduleType) {
+      case 0x01:
+      case 0x51: {
+        const module = Decoders.Trackable(moduleData, header.isLittleEndian);
+        modules.push(module);
+        packetModuleOffset += module.size;
+        break;
+      }
+      default:
+        console.error(`unknown RTTrPM submodule type: ${moduleType}`);
+        break;
+    }
+  }
+
+  return {
+    header,
+    modules,
+  };
+};