Allowing port 21 through my router when using TFTPClient caused a data error 
when attempting to send a file.

Allowing port 20 cured this.

Sniffing the net showed that 22 has worked in some cases. Also, there is a 
difference between active and passive in terms of the extra port used.

Can TFTPClient just use the one port? I am sure that I normally only need to 
open port 21 at the router for things like CuteFTP.

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