What are common issues encountered when setting up OpenWrt Cloudflare ACME and how can they be troubleshot?

Common issues include: 1. **Incorrect Cloudflare API Token/Permissions**: Double-check the token value and ensure it has 'Zone:DNS:Edit' permissions for the correct zone. 2. **DNS Propagation Delays**: Sometimes, Cloudflare's DNS updates can take a few moments. `acme.sh` usually has retry logic, but manual intervention might be needed. 3. **Firewall Issues**: Ensure your OpenWrt router can make outbound HTTPS connections to Cloudflare and Let's Encrypt APIs (ports 80 and 443). 4. **Incorrect Domain Configuration**: Verify the domain name used in the ACME command matches your Cloudflare-managed domain exactly. 5. **ACME Client Errors**: Always check the logs generated by your ACME client (e.g., `/root/.acme.sh/acme.sh.log` for `acme.sh`) for specific error messages, which are highly informative.