New feature: Ability to use a custom CA certificate for MQTT broker #19
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The certificate must be in DER format, and uploaded to SPIFFS.
void useCustomCaCert(const char* cert);
accepts a path to a certificate stored on the SPIFFS filesystem.In the
ESPHelper::begin()
method, if the secureClient is used and the certificate file exists on SPIFFS, it will be loaded into the client.