* Don't return `true` with WiFiClientSecureBearSSL::connected() when disconnected
Apply the same condition as with normal WiFiClient - we are not connected
when it's not possible to both write and read.
Implement separate methods for actual connection status and the internal
ssl engine status and update methods that were previously using available()
for this purpose
Update examples to check available() when the intent is to only read the
data and not interact with the client in any other way. Also, use connect()
as a way to notify errors, no need to check things twice
The root certificate used in the example to connect to api.github.com has expired.
A new certificate was issued on March 3, 2021 and should be valid for a year.
In the HTTPS example we were using a fingerprint which changes almost
daily as the github.com certificates are regenerated. Replace this with
a trust anchor based on the ultimate root CA that github.com uses to
sign their certificates. Assuming they don't change CAs, this
certificate should be good until 2030+
Fixes#7489
The certificate fingerprint included with the HTTPSRequest example seems
to be for an expired api.github.com certificate. Replace with the current
one to avoid reporting "certificate mismatch" errors when running.
