> How easy are those modules to use?  If reliability is an issue, do
> you need to use an error detecting code?

Just to clarify - I said "my" modules are transceivers. They came
from Oatley too but are not the TX434/RX434 (which are not
bi-directional) and were slightly more expensive at NZ$9 each

Although I've not looked into in depth yet, I would imagine error
checking would be simpler with a bi-directional link, as you can
send checksum/data verification from either/both ends

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