How to put the printer supply level in some items

Setup, Configuration and Use Beginners
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1

Hi folks,

I need your suggestion how to have some items where I can see the ink level of my supplies inside my Canon printer.

Idea is to create a Think with the command

ink -b bjnp://IP_of_your_printer

then create 6 items for each toner, adding the right additional args:

| awk ‘/Black:/ { print $NF }’
| awk ‘/Photoblack:/ { print $NF }’
| awk ‘/Yellow:/ { print $NF }’
| awk ‘/Magenta:/ { print $NF }’
| awk ‘/Cyan:/ { print $NF }’
| awk ‘/Photogrey:/ { print $NF }’

Is this the right approach in OH2?

I can try to figure out how to create the Thing:

Thing exec:command:printertonlev [command="/usr/bin/ink -b bjnp://IP_of_your_printer %2$s", interval=15, timeout=5]

But now? is it possible to add additional args without a rule, directly in the item definition?

thanks
Andrea

2

Another option is to create 6 Things, one for each toner.

But I would like to understand what is the best approach considering I’m now in OH2.

thanks :slight_smile:
Andrea

3

See the Input channel in the docs https://docs.openhab.org/addons/bindings/exec/readme.html#channels

%2$s will be replaced with the contents of the Item linked to the Input channel. Sending a command to the Item linked to the Input channel will cause the script to execute.

4

Why not use the SNMP binding?
See Monitor printer ink level with Openhab using SNMP

Works perfect for me

5

Because it seem my printer is not snmp enabled (no snmpwalk output, and no snmp configuration). Canon MG8150.

6

Creating the thing:

Thing exec:command:mg8150toner [command="/usr/bin/ink -b bjnp://192.168.10.3 %2$s", interval=15, timeout=5]

I see this error:

2018-03-30 02:17:37.223 [ERROR] [hab.binding.exec.handler.ExecHandler] - An exception occurred while formatting the command line with the current time and input values : ‘Format specifier ‘%2$s’’

maybe usual issue with openhab user permissions?

@rlkoshak any suggestion?

thanks
Andrea

7

In the meantime I’ve left exec binding for OH2 and I’ve used a simple rule:

(example for Black ink)

rule MG8150toner
when
Time cron “* 0/15 * * * ?” // this one cycles every 15 minutes.
then
val black = executeCommandLine(“sh /etc/openhab2/myscripts/CanonMG8150_SupplyLev_Black.sh”, 5000)
CanonMG8150_SupplyLev_Black.postUpdate(black)
end

and just one item (Number!!!)

Number CanonMG8150_SupplyLev_Black “Black Level [%d %%]” (gFF_Library, gMaintenance)

cheers
Andrea

8

Team,

how can say in the rule “if the printer is off, stop the rule”?

this will prevent some errors in my logs.

Any idea?

thanks
Andrea

9

You can use the CUPS binding (https://www.openhab.org/addons/bindings/cups1/) for that:

if (Printer.state==OFF) {