Protocol: renew device certificate if it is not valid #53
+72
−14
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The device certificate was obtained only once, during the first connection. However, certificates may change over time
(e.g. by substituting an expired one with a valid one). Obtain a new certificate if the old one is not valid anymore.
As paho mqtt client does not expose TLS errors upon reconnection, a custom open connection function was added.
See #11.