How can the ThingsBoard Rule Chain be utilized to gather all the email addresses of customer users?

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To gather all the email addresses of customer users in ThingsBoard using the Rule Chain, you can follow these steps:

1. Create a new Rule Chain in ThingsBoard.
2. Add a 'Data Converter' node to convert the incoming payload into JSON format.
3. Add a 'Filter' node to filter the incoming payload and only process messages that contain customer user data.
4. Add a 'Script' node to extract the email addresses from the payload and store them in a variable.
5. Add a 'Function' node to store the email addresses in a database or send them to an external system.

The script in the 'Script' node can look something like this:

var emailAddresses = [];
var users = msg.payload.users;

for(var i=0; i<users.length; i++){
  if(users[i].isCustomer){
    emailAddresses.push(users[i].email);
  }
}

msg.emailAddresses = emailAddresses;

The 'Function' node can then store the email addresses in a database or send them to an external system using an HTTP request or email integration.