DAEMON msg delay

General
1

At first I would like to thank you for the work you are doing on node-red. I simply love it. It is not very often when I got stuck with something, becouse of outstanding documentation, forum and intuitiveness of node-red itself.

I would like to ask for explaining the behavior of node-red-node-daemon. See the situation: I have an CMD.exe application, which has its own set of commands. Daemon starts normally - shows running. Than I inject for CMD.exe specific commands:

INJECT RECEIVED
Command A nothing
Command B Response for Command A
Command C Responce for Command B
ect.

This is only working when "Add [enter] to every message sent ?" is checked. But it seems to me, that daemon adds [enter] in the begining of the message, thus it delays the output. Maybe it is caused by the CMD.exe, but when I check the behavior of it using command line, it works as it should - returns response for sent command.

Is there a way, how to look under the hood of daemon node and see, what is exactly fullfilling and returning? Debug node shows only the result, not the process.
Is there a way, how to send [enter] via inject node? (Found discussion related to this, but the solution was to use ECHO - in this case it seems not to be possible).

Best regards, thanks in advanced
Stepan

2

HI,

for Enter - rather than inject a type String... which will indeed take the \n character and send \ followed by n - try the JSON type as the "Command A\n" will send Command A(Enter).

Also does you cmd.exe buffer up it outputs ? certainly python apps do and so they only send results when the buffer is full or they finish unless told to send output unbuffered.

3

Hi,

this was pretty good tip, thank you for that. However the output is still one msg delayad. Eventhough I am now able to use [enter] alone, it does not output anything until Command, which outputs valid result, is applied. I am sure, that it is not buffering the output, but I will try to use -u suffix to prove that.

Neverthless by knowing the delay is present, it is possible to use it seamlessly.

Thank you for your help.

4

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