SHTC1_CMD_LENGTH
ret = i2c_master_send(client, shtc1_cmd_read_id_reg, SHTC1_CMD_LENGTH);
if (ret != SHTC1_CMD_LENGTH) {
int ret = i2c_master_send(client, data->command, SHTC1_CMD_LENGTH);
if (ret != SHTC1_CMD_LENGTH) {