/// <summary>
/// Start network discovery. The discovery of a node will result in a <see cref="NodeDiscovered" /> event.
/// </summary>
/// <param name="timeout">The amount of time to wait until discovery responses are ignored</param>
/// <remarks>During network discovery nodes may be unresponsive</remarks>
public async Task DiscoverNetworkAsync(TimeSpan timeout)
{
var atCommandFrame = new AtCommandFrameContent(new NetworkDiscoveryCommand());
await ExecuteMultiQueryAsync(atCommandFrame, new Action <AtCommandResponseFrame>(
async frame =>
{
var discoveryData = (NetworkDiscoveryResponseData)frame.Content.Data;
if (NodeDiscovered != null && discoveryData?.LongAddress != null && !discoveryData.IsCoordinator)
{
var address = new NodeAddress(discoveryData.LongAddress, discoveryData.ShortAddress);
// XBees have trouble recovering from discovery
await Task.Delay(500);
try
{
var node = await GetNodeAsync(address);
var signalStrength = discoveryData.ReceivedSignalStrengthIndicator?.SignalStrength;
NodeDiscovered?.Invoke(this,
new NodeDiscoveredEventArgs(discoveryData.Name, signalStrength,
node));
}
catch (TimeoutException)
{
/* if we timeout getting the remote node info, no need to bubble up.
* We just won't include the node in discovery */
}
}
}), timeout);
}
private async Task OnNodeDiscovered(AtCommandResponseFrame frame, CancellationToken cancellationToken)
{
var discoveryData = (NetworkDiscoveryResponseData)frame.Content.Data;
if (NodeDiscovered == null || discoveryData?.LongAddress == null || discoveryData.IsCoordinator)
{
return;
}
var address = new NodeAddress(discoveryData.LongAddress, discoveryData.ShortAddress);
// XBees have trouble recovering from discovery
await Task.Delay(1000, cancellationToken);
try
{
var node = await GetNodeAsync(address);
var signalStrength = discoveryData.ReceivedSignalStrengthIndicator?.SignalStrength;
NodeDiscovered?.Invoke(this,
new NodeDiscoveredEventArgs(discoveryData.Name, signalStrength,
node));
}
catch (TimeoutException)
{
/* if we timeout getting the remote node info, no need to bubble up.
* We just won't include the node in discovery */
}
}
private void OnNewNodeDiscovered(object sender, NodeEventArgs e)
{
e.Node.AddedToDiscovery = true;
NodeDiscovered?.Invoke(this, e);
}
/// <summary>
/// Fires and handles the node discovered event.
/// </summary>
/// <param name="e">The event arguments.</param>
protected virtual void OnNodeDiscovered(NodeDiscoveryEventArgs e)
{
NodeDiscovered?.Invoke(this, e);
}
private void OnNewNodeDiscovered(object sender, NodeEventArgs e)
{
NodeDiscovered?.Invoke(this, e);
}
