Re: Stream device error when processing unsolicited commands

[Eric Norum <eric@norum.ca>]

Perhaps an interposed layer of your own code might be able to massage the values from the device into some sort of reasonable format that StreamDevice could handle?

On Jan 2, 2015, at 3:31 PM, Andrew Gomella <andrewgomella@gmail.com> wrote:

Hi Everyone,

I have a particularly tricky serial device I am working on programming. To make matters worse it has a very slow response speed to commands. 

It sends unsolicited commands, but also does normal request response messages. I am usually polling the device every 4 seconds while it is running. Very often when receiving the unsolicited commands I receive the following error:

2014/12/30 20:14:13.939 timerQueue XR:Message lockRequest: pasynManager->queueRequest() failed: asynManager::queueRequest is already queued

I tried searching techtalk but cannot seem to find anyone with a similar issue. This is very problematic because this device is very slow and the unsolicited messages are the most important.  Also I should mention that all commands I receive from the device need to be acknowledged, so immediately after the "in" string in the protocol follow I have an out string with the same format. 

(Another problem I have is that if the device has messages to send very close together in timing it will group them into a single message but with an unpredictable order. I have no idea how to deal with this. I can imagine a cascading mismatch sequence but this would be very complex. Is regex the only other option? When it does group the messages they are delimited by a space, but in all other instances it is just single messages with no space. I almost need some sort of function to search for a space and if it finds it to separate the messages, but otherwise ignore the normal messages).

I'm using stream device 2-6 and asyn4-21. Unfortunately can't post the db or protocol file because I had to sign a NDA for this device. 

Thank you!

Andrew

 

-- 
Eric Norum
eric@norum.ca