Error when reopening the Generic ANT Channel

Thanks for the report. We will look into this issue.

Did you receive the channel close event before you attempted to re-open the channel?

If not, when you send the initial close command the channel will be in "Closing" state. The channel will not be considered "Closed" (and hence, openable), until you receive the event "MSG_CODE_EVENT_CHANNEL_CLOSED".

I checked version 0.1.1 and 0.2.4 of the SDK by adding the following if statement and println to look for the message after the GenericChannel.close() function was called. The "channel got closed" text never gets printed to the console in either SDK version although the 0.1.1 version allows the channel to be reopened and the 0.2.4 version crashes.

function onMessage(msg)
{

// Parse the payload
var payload = msg.getPayload();

if( Ant.MSG_CODE_EVENT_CHANNEL_CLOSED == (payload[1].toNumber() & 0xFF) )
{
System.println("channel got closed");
}

Hi beckettc,

I added some more debug code to help see what's going on. I added the following println's to the OnMsg function to see exactly what was coming back for messages. I never seem to get the channel closed message, but the messages are different between SDK 0.1.1 where the code works and SDK 0.2.4 where it does not work.

function onMessage(msg)
{
// Parse the payload
var payload = msg.getPayload();
System.println(msg.messageId.toNumber());

if (payload.size() > 0)
{
System.print((payload[0] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 1)
{
System.print((payload[1] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 2)
{
System.print((payload[2] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 3)
{
System.print((payload[3] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 4)
{
System.print((payload[4] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 5)
{
System.print((payload[5] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 6)
{
System.print((payload[6] & 0xFF).toNumber());
System.print(", ");
}
if (payload.size() > 7)
{
System.print((payload[7] & 0xFF).toNumber());
System.print(", ");
}
System.println(" ");

Then I ran several tests in both version of the SDK. In one case, GenericChannel.close() was issued followed by a new Ant.DeviceConfig which set the device id to 0 and turned on proximity pairing and then no more comments. The other case was the same sequence followed by the GenericChannel.open(). In both cases the channel was receiving data from a sensor when the commands were sent. The following shows the console output for these 2 cases in both SDK versions.

Message ID and Payload Data (DECIMAL FORMAT)

SDK 0.1.1 – Close – Set Proximity Pairing
78 <-- Message ID
1, 253, 0, 8, 40, 165, 168, 162, <--Payload
78
1, 253, 0, 8, 40, 165, 168, 162,
78
1, 253, 0, 8, 40, 165, 168, 162,
64
113, 0, 0, <-- This is a Proximity Pairing Message

SDK 0.1.1 – Close – Set Proximity Pairing - Open
78 <-- Message ID
1, 124, 0, 8, 67, 5, 45, 180, <--Payload
78
1, 124, 0, 8, 67, 5, 45, 180,
64
75, 0, 0, <-- This is a message that the channel is open. We don’t see the proximity pairing message. When it finds the new sensor, it starts running again.

SDK 0.2.4 – Close – Set Proximity Pairing
78
1, 149, 0, 8, 31, 5, 40, 165,
78
1, 149, 0, 8, 31, 5, 40, 165,
78
1, 149, 0, 8, 31, 5, 40, 165, <--No message after the close

SDK 0.2.4 – Close – Set Proximity Pairing – Open
78
1, 185, 0, 8, 45, 5, 40, 160,
78
1, 185, 0, 8, 45, 5, 40, 160,
Failed invoking <symbol>
System Error
in open (C:\Users\Rog\Documents\Eclipse\workspace\MCyc11\source\MO2Sensor.mc:202)
in open (C:\Users\Rog\Documents\Eclipse\workspace\MCyc11\source\MO2Sensor.mc:202)
in onMenuItem (C:\Users\Rog\Documents\Eclipse\workspace\MCyc11\source\MCycMenuDelegate.mc:90)
System Error

FWIW you can restart with the following: release, initialize, set config, open.

Thanks SHARKBAIT. That did the trick!!