When performing a single channel process, scripts can be used to set the current capture channel. The following Script detects the ZigBee change message command and changes the captured channel accordingly. Note that the channel change may take 100’s of msec from the reception of the change channel command (due to the way received messages are processed and transferred to the Scripts).
public override void DoScript(Packet packet) // don't remove this line
{
// Do your packet filtering logic here
packet.AddToTimeView();
if ((packet.Field("ZDPCmd").Exist) &&
(packet.Field("ZDPCmd").Value == 56) && // Management Network Update Request command
(packet.Field("ZDPScanDuration").Value == 254)) // Change Channel command identification
{
packet.AddToTimeView(Color.SaddleBrown);// set time view message color to Brown
int channelMask = (int) packet.Field("ZDPScanChannels").Value;//Get the channel number to change to from the masked value
int channelNmb = -1;
while (channelMask != 0)
{
channelMask = channelMask >> 1;
channelNmb ++;//Set the channel number to change to
}
Loggers.EventsLogger.Info("Data Capture Channel was changed to, " + channelNmb);
ChangeChannel(channelNmb); // if this is a single channel capture, change channel (may take 100's of msec)
}
base.DoScript(packet); // don't remove this line
For example after receiving the a command on channel 13 instructing to change channel to number 15, the Peryton-S analyzer changes from channel 13 to 15 and continuous to capture messages on the new channel:
Figure 362 – Channel 13 is captured before receiving the channel change command
Figure 363 – Capturing channel is changed to 15 after receiving the channel change command