diff --git a/libpldm/firmware_update.c b/libpldm/firmware_update.c
new file mode 100644
index 0000000..25b2997
--- /dev/null
+++ b/libpldm/firmware_update.c
@@ -0,0 +1,17 @@
+#include "firmware_update.h"
+
+int encode_query_device_identifiers_req(uint8_t instance_id,
+					size_t payload_length,
+					struct pldm_msg *msg)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_QUERY_DEVICE_IDENTIFIERS_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	return encode_pldm_header_only(PLDM_REQUEST, instance_id, PLDM_FWUP,
+				       PLDM_QUERY_DEVICE_IDENTIFIERS, msg);
+}