SSL cert is dead: https://www.ssllabs.com/ssltest/analyze.html?d=api.viessmann.com
Source:
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='api.viessmann.com', port=443): Max retries exceeded with url: /iot/v1/equipment/installations?includeGateways=true (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)')))
