HTTP Binding Motion detection for Reolink IP camera

rossko57 · November 17, 2019, 3:28pm

That’s a bit odd really; I thought
JSONPATH($.xxx
defaulted to
JSONPATH($[0].xxx
by itself.

If you post your working htttp.cfg and Item definitions, it may help others later who run into similar problems.

thisisIO · November 17, 2019, 3:38pm

http.cfg is unchanged. All is commented.

Item is here

String Camera1Motion "Camera 1 Motion [%s]" { http="<[http://192.168.XX.XX/api.cgi?cmd=GetMdState&user=admin&password=123456:1000:JSONPATH($[0].value.state)]" }

But it is not the last edition. This “0” and “1” must be converted to “ON” and “OFF” and item type must be “switch” i think. Now i am looking for the way how to do it. It must be map transformation, but how to put it insode JSONPATH i can not understand.

Sure that you know)

rossko57 · November 17, 2019, 3:42pm

Do it the other way around - use a javascript transform instead of JSONPATH transform, that does the JSON parsing and uses that to choose the return string ON/OFF

thisisIO · November 17, 2019, 3:45pm

So i make an item this way

String MotionTest "Current Channel [%s]" { http="<http://192.168.178.36/api.cgi?cmd=GetMdState&user=admin&password=123456:1000:JS(getValue.js)]" }

but i am not good in javascript, need your help how do i parse it inside the getValue.js ?

rossko57 · November 17, 2019, 3:58pm

There is an example in the HTTP binding docs, right alongside the JSONPATH example.

thisisIO · November 17, 2019, 4:00pm

Yes i have found it but it do not work for me

My getValue.js

JSON.parse(input).$[0].value.state;

thisisIO · November 17, 2019, 4:05pm

I made simple function like to check

(function(i){ 
	return i;
})(input)

but it do not work(((

By the way Javascript Trans is installed http://prntscr.com/py5qa1

thisisIO · November 17, 2019, 4:33pm

Made it!

Here is all

.item

Switch Camera1Motion "Camera 1 Motion [%s]" { http="<[http://192.168.XX.XX/api.cgi?cmd=GetMdState&user=admin&password=123456:1000:JS(cameraMotion.js)]" }

cameraMotion.js

(function(x){
    var json = JSON.parse(x);
    if (json[0].value.state)
    {
        result="ON";
    }
    else
    {
        result="OFF";
    }
    return  result;
})(input)

.sitemap

Frame label="Camera Motion" {   
    Default item=Camera1Motion
}

rossko57, thanks for help!

Gad_Ofir · August 23, 2020, 7:25am

Hello more of preformance Q…

@rossko57, i have set this up in node-red

working great! but i notice that its very fast going from true to false
i am planing on somthing like 12 cameras , and when my DIY alram is on
i am not home and , i will starting querying the the cameras

but still i am worried , will this kind of traffic damge/slow my network ?
what kind of intravel will you set ?
is there any way to make the camera change a litle slower

thanks!

rossko57 · August 23, 2020, 9:08am

I don’t know anything about node red, I’m afraid.

Gad_Ofir · August 23, 2020, 9:42am

i was showing node red as an expmle …

i assume that the JS script also will send a GET request each time he wants a reply?
or maybe it is listening to changes?
just trying to understand if there is any diffrance between what i am doing and above…

rossko57 · August 23, 2020, 10:07am

The JS script doesn’t send anything. It just extracts data from incoming HTTP.

@thisisIO Item is set up to send HTTP request once a second.

Gad_Ofir · August 23, 2020, 12:00pm

so this approch will also send HTTP request each sec…to every camera
i am by no way a network expert, i am just asking

lets say 12 camers will send 12 requests in a sec time period (thats 1036800 a calls a day)
do you think this a problem ,or this is simaple request and the network can handle this ?
i have a beefy network switch , but maybe its worth looking on other approch

for now i just have two reolink camras …

rossko57 · August 23, 2020, 12:09pm

Ethernet switches might be capable of 15,000 to a million packets per second. I do not think 24 packets (12 requests, 12answers) will stress it very much. But this is not a networking performance advice forum.

Whether you have to do this polling, or you can instead set up your cameras to send unsolicited messages in response to real events is a function of your cameras capabilities. There are only the two ways to do this.

Gad_Ofir · August 23, 2020, 12:12pm

wow great to hear now i can buy more cameras
lets just hope that node red is up to the task
thanks for all the help!

thisisIO · August 23, 2020, 12:16pm

After some tests, i can say, that one second it is really not enought, it looses many movements.
But i thing the probem is not in switches, but in resources of platform that computes this requests.

thisisIO · August 23, 2020, 12:45pm

Buy better a normal camera that sends movement by itself without polling (read - with support of motion detection by OH)
Realy to say, Reolink does it, but it do not supportted by OH, so you need to poll it.

Gad_Ofir · August 23, 2020, 3:59pm

do you know of such ?

i was sure the reolink is the one , but i am planing to buy 10 more so if you have any wisdom please share
maybe @matt1 can tell us what is the most feature rich for this kind of use

thisisIO · August 23, 2020, 4:11pm

There is a topic in Community.
Search for something like ip camera binding. The biggest one. The is a list of compatible cams like dahua and so on.
Nativly reolink support it in onvif, but this binding do not work with it. I tested it for half year, maybe now smth changed. Read that thread.

matt1 · August 24, 2020, 10:17pm

I believe something has changed as we have a few users of reolink now using the binding.

@Gad_Ofir
The cameras with the most features are the ones that are both api and Onvif. This post Linked below breaks it down. I would not go for a non onvif camera as you gain a lot by having this as a bare minimum.