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Shell Programming and Scripting

Telnet script to amplifier

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Top Forums Shell Programming and Scripting Telnet script to amplifier
# 15  
Old 05-14-2014
Quote:
Originally Posted by Corona688
Code:
#!/bin/bash

# Might need \r\n, not sure
T="\n"

amp() {
        printf "%s${T}" "$*" | nc 192.168.1.155 8192 -q 1
}


REPLY=$(amp "?p")

echo "Got reply '$REPLY'"

if [[ "$REPLY" == *PWR0* ]]
then
        echo "got PWR0"
        amp "MZ"
else
        echo "Did not get PWR0"
fi

I run the script and gave me a output, but it was wrong, The amplifier is on, but it gave me did not get PWR0. I changed the port to 8102 and to 23, both gave the same result. Why did you made it port 8192? mistake? I also eddit it with another command, like ?V (which is volume, it should give me VOL125... But it didn't) So I saw you added a comment, maybe it needs \r\n. where does it go? Many thanks for your help! I think we are on the right track :-D
Last edited by drogert; 05-14-2014 at 06:17 PM..
# 16  
Old 05-14-2014
It would be nice to know what output -- not just that it was "wrong" -- that's why I put the debugging statements in it, to tell what's happening.

T="\r\n" instead of T="\n" but don't bother doing that yet until you've posted the actual output for us to look at...
# 17  
Old 05-14-2014
well, when I run the script:

Code:
pi@domoticzpi ~ $ . /home/pi/domoticz/scripts/bash/versterkeruit2.sh
Got reply ''
Did not get PWR0

It gave me this... How did you expected the debugging info? Am I running it the wrong way? sorry, but im a bit of a noob, I am trying my best though...
# 18  
Old 05-14-2014
I expected some sort of reply to be between the two ' ', instead of nothing. It's getting no answer at all.

You should do chmod +x ./scriptname once, then you will be able to run the script properly with ./scriptname

Try \r\n. It might not have seen the command if it wanted the \r.

You could also try -q 2, though that'd make it lag longer.
# 19  
Old 05-14-2014
Ok, I changed it with -q 2 and added the T="\r\n"

It now DOES give a respond:

Code:
pi@domoticzpi ~ $ . /home/pi/domoticz/scripts/bash/versterkeruit2.sh
'ot reply 'PWR0
got PWR0

:-D only it doesn't mute, so maybe it needs more lag?
# 20  
Old 05-14-2014
You are still running it wrong, see my above post for how to run it properly. It doesn't technically matter here, but for other scripts may matter a lot.

Interesting... The reply seems to only contain a carriage return, not a newline. (Which is why the last ' gets sent the back of the line) Perhaps you should try T="\r"
# 21  
Old 05-14-2014
Hi,

I was trying some things out and I think I got it!

This what I did:

Code:
#!/bin/bash

# Might need \r\n, not sure
T="\r\n"

amp() {
        printf "%s${T}" "$*" | nc 192.168.1.155 8102 -q 2
}


REPLY=$(amp "?p")

echo "Got reply '$REPLY'"

if [[ "$REPLY" == *PWR0* ]]
then
        echo "got PWR0"
	sleep 1
        amp "MZ"
else
        echo "Did not get PWR0"
fi

I added a sleep 1 between the echo and the amp

and it gave me this:

Code:
pi@domoticzpi ~ $ . /home/pi/domoticz/scripts/bash/versterkeruit2.sh
'ot reply 'PWR0
got PWR0
FL022020204D555445204F4E20202020
MUT0

It mutes! And when I run the script again it un-mutes!

I think we've got it! I will try the T="\r" to see if it makes any difference
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