Gets the peer's gio.tls_certificate.TlsCertificate associated with msg's connection.
Note that this is not set yet during the emission of signalMessage::accept-certificate signal.
msg's TLS peer certificate, or null if msg's connection is not SSL.
Gets the peer's gio.tls_certificate.TlsCertificate associated with msg's connection.
Note that this is not set yet during the emission of signalMessage::accept-certificate signal.