updates

my_components/nimble_tracker/string_utils.h

@@ -0,0 +1,18 @@
+// Copied from https://github.com/ESPresense/ESPresense/blob/master/lib/BleFingerprint/string_utils.h
+#pragma once
+#include <string>
+
+#define Sprintf(f, ...) ({ char* s; asprintf(&s, f, __VA_ARGS__); std::string r = s; free(s); r; })
+
+namespace esphome
+{
+    namespace nimble_tracker
+    {
+
+        std::string hexStr(const uint8_t *data, int len);
+        uint8_t hextob(char ch);
+        bool hextostr(const std::string &hexStr, uint8_t *output, size_t len);
+
+    } // namespace nimble_tracker
+
+} // namespace esphome