diff --git a/src/dsp/file.c b/src/dsp/file.c
index 05dba3b..fb3d1de 100644
--- a/src/dsp/file.c
+++ b/src/dsp/file.c
@@ -126,3 +126,68 @@
 
 	return 0;
 }
+
+LIBPLDM_ABI_TESTING
+int encode_pldm_file_df_heartbeat_req(
+	uint8_t instance_id, const struct pldm_file_df_heartbeat_req *req,
+	struct pldm_msg *msg, size_t payload_length)
+{
+	PLDM_MSGBUF_DEFINE_P(buf);
+	int rc;
+
+	if (!req || !msg) {
+		return -EINVAL;
+	}
+
+	struct pldm_header_info header = { 0 };
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FILE;
+	header.command = PLDM_FILE_CMD_DF_HEARTBEAT;
+
+	rc = pack_pldm_header_errno(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	rc = pldm_msgbuf_init_errno(buf, PLDM_DF_HEARTBEAT_REQ_BYTES,
+				    msg->payload, payload_length);
+	if (rc) {
+		return rc;
+	}
+
+	pldm_msgbuf_insert(buf, req->file_descriptor);
+	pldm_msgbuf_insert(buf, req->requester_max_interval);
+
+	return pldm_msgbuf_complete(buf);
+}
+
+LIBPLDM_ABI_TESTING
+int decode_pldm_file_df_heartbeat_resp(const struct pldm_msg *msg,
+				       size_t payload_length,
+				       struct pldm_file_df_heartbeat_resp *resp)
+{
+	PLDM_MSGBUF_DEFINE_P(buf);
+	int rc;
+
+	if (!msg || !resp) {
+		return -EINVAL;
+	}
+
+	rc = pldm_msg_has_error(msg, payload_length);
+	if (rc) {
+		resp->completion_code = rc;
+		return 0;
+	}
+
+	rc = pldm_msgbuf_init_errno(buf, PLDM_DF_HEARTBEAT_RESP_BYTES,
+				    msg->payload, payload_length);
+	if (rc) {
+		return rc;
+	}
+
+	pldm_msgbuf_extract(buf, resp->completion_code);
+	pldm_msgbuf_extract(buf, resp->responder_max_interval);
+
+	return pldm_msgbuf_complete_consumed(buf);
+}