To update command parameters, use the command unit/update_command_alias:

svc=unit/update_command_alias&params={"itemId":<long>,
				      "id":<long>,
				      "callMode":<text>,
				      "n":<text>,
				      "c":<text>,
				      "l":<text>,
				      "p":<text>}

Command types:

• block_engine - block engine;
• unblock_engine - unblock engine;
• custom_msg - custom message;
• driver_msg - message to driver;
• download_msgs - download messages;
• query_pos - query position;
• query_photo - query snapshot;
• output_on - activate output;
• output_off - deactivate output;
• send_position - send coordinates;
• set_report_interval - set data transfer interval;
• upload_cfg - upload configuration;
• upload_sw - upload firmware.

Link types:

• empty string - auto;
• tcp - TCP;
• udp - UDP;
• vrt - virtual;
• gsm - SMS.

On create and edit:

[
	<long>,		/* command ID */
	{
		"nm":<text>,	/* command name */
		"cn":<text>,	/* command type */
		"lt":<text>,	/* link type */
		"cp":<text>	/* parameters */
	}
]

On delete:

[
	<long>,		/* command ID */
	null
]