diff --git a/ESP-IDF_GPS/main/nmea_example.h b/ESP-IDF_GPS/main/nmea_example.h
new file mode 100644
index 000000000..95bdf9b40
--- /dev/null
+++ b/ESP-IDF_GPS/main/nmea_example.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <stddef.h>
+
+/**
+ * @brief Initialize the interface connected to the GPS (I2C or UART)
+ */
+void nmea_example_init_interface(void);
+
+/**
+ * @brief Get one NMEA message line from the GPS.
+ *
+ * Note, the returned buffer pointer is only valid until the next call to this function.
+ * If no data was received, out_line_len is zero.
+ *
+ * @param[out] out_line_buf  output, pointer to the buffer containing the NMEA message
+ * @param[out[ out_line_len  length of the message, in bytes
+ * @param[in] timeout_ms  timeout for reading the message, in milliseconds
+ */
+void nmea_example_read_line(char **out_line_buf, size_t *out_line_len, int timeout_ms);
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