Learn how to install Transmission and manage torrents remotely.

Transmission is a simple torrent daemon with a built-in web UI. It is generally used on NAS devices, but it can also be used on ASUS routers.

ENVIRONMENT

Installation environment details.

REQUIREMENTS

The essential requirements are as follows:

ASUSWRT-MERLIN installed
SSH access enabled
Entware installed
Sufficient capacity of USB storage
This document uses two storage devices.
Additional cooling
The default heat dissipation features may not be sufficient.

INSTALLATION

Access the router via SSH in the terminal.
Install the package.
```
opkg update
opkg install transmission-web
```
After updating Entware, install the web interface.

CONFIGURATION

KILL TRANSMISSION

Before modifying the settings, stop Transmission.
If you do not stop it, you will not be able to make changes.

/opt/etc/init.d/S88transmission stop

Use the script to stop Transmission.

EDIT SETTINGS

Edit the Transmission configuration file, /opt/etc/transmission/settings.json, using the default editor, vi.

Open the configuration file.
```
vi /opt/etc/transmission/settings.json
```
Open the configuration file using vi.
Modify the properties.
- Check the properties to modify.
```
"download-dir": "/mnt/XIYOsD10/home/xiyo/downloads",
"incomplete-dir": "/mnt/XIYOsD10/var/tmp/transmission/incomplete",
"rpc-password": "test1234",
"rpc-username": "root",
"watch-dir": "/mnt/XIYOsD10/home/xiyo/watchdir",
```
  XIYOsD10 is the name of the mounted storage.
  - download-dir
    This is the location where downloaded files will be saved.
  - incomplete-dir
    This is the location where downloading torrent files will be saved.
    The incomplete-dir-enabled property must be set to true (default).
  - rpc-password
    This is the password used for remote access.
    The default is blank, allowing access without a password.
    The password will be encrypted upon the first access after the daemon starts.
  - rpc-username
    This is the ID used for remote access.
    The default is root.
  - watch-dir
    This is the location where torrent files will be automatically loaded.
    The watch-dir-enabled property must be set to true (default).
  Transmission will automatically create the directories specified in the configuration file if they do not exist, so you do not need to create them manually.
1. To find a word, press / and enter the text you want to search for.
2. To edit text, press i to switch to insert mode.
  After finishing your edits, press ESC to switch back to command mode.
3. To save, in command mode, type :wq and press Enter to save and exit the editor.

START TRANSMISSION

Start Transmission.

/opt/etc/init.d/S88transmission start

Use the script to start Transmission.

OPEN FIREWALL

Open the firewall to effectively connect with peers.

OPEN PORT

Add the ports to the firewall that will allow inbound connections.

iptables -I INPUT -p tcp --dport 51413 -j ACCEPT
iptables -I INPUT -p udp --dport 51413 -j ACCEPT

Add the ports used by Transmission to the firewall.
TCP is used for downloading files, while UDP is used for connecting to trackers and peers.

SAVE RULES

Since the firewall rules will disappear every time the router restarts, set it up so that the rules are applied on each restart.

FILE="/jffs/scripts/firewall-start"; \
[ ! -f "$FILE" ] && \
echo "#!/bin/sh" > "$FILE" && \
chmod +x "$FILE"; \
echo -e "\n# Allow Transmission" >> "$FILE"; \
echo "iptables -I INPUT -p tcp --dport 51413 -j ACCEPT" >> "$FILE"; \
echo "iptables -I INPUT -p udp --dport 51413 -j ACCEPT" >> "$FILE"

If the firewall-start file does not exist, create it and add the firewall rules to the file.

AUTO START

Set Transmission to start automatically every time the router restarts.

Since Transmission uses additional storage, it should not run until the storage is mounted.
Set it to run immediately after the drive is mounted.

Check for the file.
Verify if the script to run after mounting exists, and create it if it does not.
```
FILE="/jffs/scripts/post-mount"; \
[ ! -f "$FILE" ] && \
touch "$FILE" && \
chmod +x "$FILE" && \
echo "#!/bin/sh" > "$FILE"
```
If the post-mount file does not exist, create it and add execution permissions.
Add the auto-execution script.
Add the command to run automatically after mounting.
```
FILE="/jffs/scripts/post-mount"; \
SEARCH_STRING=". /jffs/addons/diversion/mount-entware.div # Added by amtm"; \
ADD_COMMAND="/opt/etc/init.d/S88transmission start"; \
grep -q "$SEARCH_STRING" "$FILE" || \
echo -e "\n# Entware addmon start" >> "$FILE" && \
echo "$ADD_COMMAND" >> "$FILE"
```
If you have installed or removed diversion, the mount script for diversion will exist.
In that case, the auto-execution script is already included, so no further action is needed.
If it does not exist, add the script to automatically run Transmission.

USAGE

WEB UI

Windows 11, accessed via Edge

You can access the web UI by navigating to http://RouterIP:9091 in your browser.
The ID and password are the values set in the configuration file.

TRANSMISSION CLIENT

Windows 11, server information input screen in Transmission client

The Transmission client has the capability to access remote servers.
After launching, simply enter the same information as you would for web access.

TROUBLESHOOTING

MOUNTED DIRECTORY CHANGES

If you use the default settings for storage mounting, your mounted storage names will likely be sda1, sdb1, etc.
In this case, the storage names may change every time the router restarts. Therefore, you need to ensure that the mounts are always fixed.

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