/// <summary>
/// Decode beacon from frame
/// </summary>
/// <param name="frame"></param>
/// <returns></returns>
public bool ReadFromFrame(ref Frame frame)
{
if (frame == null)
return false;
// 7.2.2.1.2 Superframe Specification field
if (frame.LengthDataUsed < 3)
return false;
int i = (int)frame.ReadUInt16(0);
beaconOrder = (Byte)(i & 0xf);
superframeOrder = (Byte)((i >> 4) & 0xf);
finalCapSlot = (Byte)((i >> 8) & 0xf);
batteryLifeExtension = (Byte)((i >> 12) & 1);
panCoordinator = (Byte)((i >> 14) & 1);
associationPermit = (Byte)((i >> 15) & 1);
// 7.2.2.1.3 GTS Specification field
i = (int)frame.ReadByte(2);
gtsLength = (Byte)(i & 7);
gtsPermit = (Byte)((i >> 7) & 1);
frame.DeleteFromFront(3);
// 7.2.2.1.4 GTS Directions field
gtsDirectionsMask = 0;
if (gtsLength > 0)
{
if (frame.LengthDataUsed < 1)
return false;
i = (int)frame.ReadByte(0);
gtsDirectionsMask = (Byte)(i & 0x7F);
frame.DeleteFromFront(1);
}
// 7.2.2.1.5 GTS List field
if (frame.LengthDataUsed < 3 * gtsLength)
return false;
gtsDescriptor = new GtsDescriptor[gtsLength];
for (int k = 0; k < gtsLength; k++)
{
gtsDescriptor[k].deviceShortAddr = frame.ReadUInt16(0);
i = (int)frame.ReadByte(2);
gtsDescriptor[k].gtsStartingSlot = (Byte)(i & 0xF);
gtsDescriptor[k].gtsLength = (Byte)((i >> 4) & 0xF);
frame.DeleteFromFront(3);
}
// 7.2.2.1.6 Pending Address Specification field
if (frame.LengthDataUsed < 1)
return false;
i = (int)frame.ReadByte(0);
pendingShort = (i & 7);
pendingExt = ((i >> 4) & 7);
frame.DeleteFromFront(1);
// 7.2.2.1.7 Address List field
if (frame.LengthDataUsed < pendingShort * 2 + pendingExt * 8)
return false;
shortAddrPending = new UInt16[pendingShort];
extAddrPending = new UInt64[pendingExt];
for (int k = 0; k < pendingShort; k++)
{
shortAddrPending[k] = frame.ReadUInt16(0);
frame.DeleteFromFront(2);
}
for (int k = 0; k < pendingExt; k++)
{
extAddrPending[k] = frame.ReadUInt64(0);
frame.DeleteFromFront(8);
}
// 7.2.2.1.8 Beacon Payload field
if (frame.LengthDataUsed > 0)
{
payload = frame;
frame = null;
}
else
{
payload = null;
Frame.Release(ref frame);
}
return true;
}
