json_object_add_value_float(tmp, "unit_mean", ipc.cali_mean);
json_object_add_value_float(tmp, "unit_stddev", ipc.cali_stddev);
json_object_add_value_float(tmp, "unit_mean", ipc.cali_mean);
json_object_add_value_float(tmp, "unit_stddev", ipc.cali_stddev);