Here's how you can generate a PDF report using XML-RPC in Odoo version 16:

1. Connect to your Odoo instance using an XML-RPC client library in your preferred programming language (e.g., Python with the xmlrpc.client module).

2. Call the render_report method on the report object. This method takes the following parameters:

   • database: The name of the target database.
   • uid: The ID of the user in Odoo (typically the admin user).
   • password: The password of the user.
   • report_name: The technical name of the report to generate.
   • doc_ids: The list of document IDs to include in the report.
   • context: Additional context to provide for report generation.

   The render_report method returns a dictionary containing the report data.

3. Use the received report data to save the PDF report file locally or process it further according to your requirements.

Example:

import xmlrpc.client

# Connect to Odoo instance
url = 'http://your_odoo_instance_url/xmlrpc/2/object'
db = 'your_database'
username = 'your_username'
password = 'your_password'
common = xmlrpc.client.ServerProxy('{}/common'.format(url))
uid = common.authenticate(db, username, password, {})

# Generate PDF report
report = xmlrpc.client.ServerProxy(url)
report_name = 'module_name.report_name'  # Technical name of the report
doc_ids = [1, 2, 3]  # IDs of the documents to include in the report
context = {}  # Additional context for report generation
report_data = report.render_report(db, uid, password, report_name, doc_ids, context)

# Save the PDF report locally
with open('report.pdf', 'wb') as f:
    f.write(report_data['result'])

Make sure to replace 'your_odoo_instance_url', 'your_database', 'your_username', 'your_password', 'module_name.report_name', and [1, 2, 3] with the appropriate values for your Odoo instance and report.