make kestrel a tak server, so that it can send and receive pois as cots data

server/utils/cotRouter.js

@@ -0,0 +1,12 @@
+/**
+ * CoT stream first-byte detection: TAK Protocol (0xBF) or traditional XML (0x3C '<').
+ * Used by tests and any code that must distinguish CoT from other protocols.
+ */
+
+export const COT_FIRST_BYTE_TAK = 0xBF
+export const COT_FIRST_BYTE_XML = 0x3C
+
+/** @param {number} byte - First byte of stream. @returns {boolean} */
+export function isCotFirstByte(byte) {
+  return byte === COT_FIRST_BYTE_TAK || byte === COT_FIRST_BYTE_XML
+}