Beacons have wrong settings

[gregbreen]

This solves the problem of devices not receiving beacons (as discussed in #129 ). Per the regional parameters specs for 1.0.3 and 1.1 beacon radio frames should:

• have a preamble of 10 symbols
• have no CRC
• have no header
• have non-inverted signal polarity

These are four differences compared to all other frame types. The current release has the header present, has the polarity inverted, and sends the standard 8 symbol preamble.

From the 1.0.3 spec:

And from the 1.0.3 regional parameters:

That is for AU915, but the beacon signal polarity is non-inverted in every region.

[beitler]

Thanks a lot, @gregbreen, for this contribution. This glitch will be rectified asap.

I am very sorry to tell you that I will not be able to merge your PR because the contributing guidelines for this project have not been setup yet. Also, your PR is missing little details: ral_slave also is affected and preferably txjob->addcrc of the BCN is set correctly in the s2e layer and not overwritten in the ral layer.

But be assured that this will be fixed in the next release.

Thanks again!

[gregbreen]

No worries @beitler . I'm not sure I understand why the contributing guidelines is a blocker, but that's OK. I'm happy to revise the PR to get it to an acceptable level.