+/**
+ * Send command with parameter.
+ *
+ * @param[in] cmd Command
+ * @param[in] param Parameter (0..999, depending on command).
+ *
+ * @retval SR_OK Success.
+ * @retval SR_ERR_ARG Invalid argument.
+ * @retval SR_ERR Error.
+ */
+SR_PRIV int send_msg1(const struct sr_dev_inst *sdi, char cmd, int param)