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More Asynchronous Stuff

More Asynchronous Stuff

As it turns out, the NIE Modem & Serial support is a good test case. It uses only asynchronous function calls, including nBind and nConnect. Binding an endpoint is not an issue, but as you might remember, an IrCOMM connect requires some handshaking. Also, the connection options are a bit different.

Two problems need to be solved to make an asynchronous connect work: Find a place where to do the IrCOMM handshake and manage the IrCOMM connection options in a way that it does not break anything else. The option management is indeed quite interesting in that the class that controls a TSerialEndpoint from the NewtonScript side evaluates the result of the connect and passes it on to the NewtonScript layer. For that purpose, it uses the options objects set in the nConnect call. To make the IrCOMM stuff play nice with this mechanism, the IrCOMM connect options have to be removed before controll passes on…

The asynchronous IrCOMM handshake will be handled either before the first send or receive operation. Another possibility is staring it from the endpoint’s event handling routine.

2003-02-06