According to NXT wiki:
In Ardor, only child chain transactions can be phased. Therefore, when account control is set for an account, it can no longer submit Ardor chain transactions.
In other words: account locked for child chain is locked for Ardor chain to.
See for details: Account_Control
You can use any script which invokes the startBundler API but note that you will need to submit the passphrase to the node in order to start a bundler so you need to somehow protect the data in this script.
The fee structure can be found on this fees chart for Ardor provided by Jelurida, the developers of Ardor.
There is no fee to mine, and no fee to bundle. But when you bundle, you are receiving child chain tokens, such as IGNIS, BITSWIFT, or AEUR, and then paying the forgers (miner-equivalent for Ardor) the respective fee in ARDR based on the chart that I ...
Here's a simple code snippet which allows you to bundle transactions if the recipients have the asset you specified in their account.
public class FilterByAsset implements Bundler....
Take a look at the bundler filter shipped with Ardor: src/java/nxt/addons/AccountPropertyBundler.java and PersonalBundler.java
You need to be familiar with internal Ardor interfaces in order to write your own bundler filter. The bundler filter runs as part of the server and is loaded during server initialization.
You specify a custom bundler in nxt....
You can specify a bundler filter using the nxt.bundlingFilter property. This is a Java class that is loaded by the bundler and will be called for each transaction to be processed. The filter returns 'true' if the transaction should be bundled and 'false' otherwise. Note that the filter executes as part of the server and thus can use any of the internal ...
From the wallet cogwheel menu select the bundlers page and start a bundler.
You will need to specify your passphrase in order to run a bundler so you'll have to run it on your own node. You also need the node admin password in order to list the bundlers.
Here is some additional discussion https://nxtforum.org/general-discussion/ardor-child-chain-bundler-...