pi433: initialization of tx config in pi433_open()

[Hugo Lefeuvre]

Hi Marcus,

I'm currently working on the following TODO:

 966         /* setup instance data*/
 967         instance->device = device;
 968         instance->tx_cfg.bit_rate = 4711;
 969         // TODO: fill instance->tx_cfg;

If a user calls write() right after open()-ing an instance, the driver
might try to setup the device with uninitialized garbage. In fact
nothing really bad will happen because the rf69 interface abstraction
will filter out wrong values, but this might be a confusing behavior
for the user.

What do you think about initializing instance->tx_cfg with the default
values of the rf69 datasheet[0] ?

Also, is there a specific reason why you chose 4711 as a default value
for the bit rate ? I couldn't find it anywhere in the datasheet nor on
the internet.

Thanks !

Regards,
 Hugo

[0] http://www.hoperf.com/upload/rf/RFM69CW-V1.1.pdf

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             Hugo Lefeuvre (hle)    |    www.owl.eu.com
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