diff --git a/include/telemetry.h b/include/telemetry.h
new file mode 100644
index 0000000..106cdc4
--- /dev/null
+++ b/include/telemetry.h
@@ -0,0 +1,11 @@
+#ifndef TELEMETRY_H
+#define TELEMETRY_H
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum { FRAME_OK, FRAME_SHORT, FRAME_VERSION, FRAME_CRC, FRAME_RANGE,
+               FRAME_DUPLICATE, FRAME_ROLLBACK } frame_result_t;
+typedef struct { uint16_t sequence; int16_t temperature_centi; uint16_t voltage_mv; } sample_t;
+frame_result_t decode_frame(const uint8_t *bytes, size_t length, sample_t *sample);
+const char *frame_result_name(frame_result_t result);
+#endif