Domoticz

Posted: **Thursday 18 July 2019 0:40**

Sending a snapshot through Telegram from a camera pointed at my front door when the door bell is pressed seems trivial. I have read several threads about it on the Domoticz forum and tried to brew a dzvents script for it. Unfortunately, with no success (yet).

First of all, I have set up the Telegram notification system and it is working when I press the Test button in Domoticz settings. Next, the script is triggered if the doorbell is pressed. But what happens next is obscure.

I have this in my script (the print statements below are only there for checking the strings sent by os.execute):

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return {
    on = { 
       devices = {'Doorbell'}
    },

    execute = function(domoticz, device)
            local teleTok   = '122356789:AABBCDEFGHIJKLMNOPQRSTUVWZYZabcdef'
            local chatId    = '987654321'
            local snapFile= '/var/tmp/camsnapshot.jpg'
            local domoReq   = 'http://123.45.67.89:8088/camsnapshot.jpg?idx=7'
            local teststring = 'wget -O "' ..snapFile..'" "' ..domoReq .. '"'
            print ("WGET string: " ..teststring)
            os.execute(teststring)
            local teststring = 'curl -s -X POST "https://api.telegram.org/bot'..teleTok..'/sendPhoto?chat_id='..chatId..'" -F photo="@' ..snapFile..'"'
            print ("POST string: " ..teststring)
            os.execute(teststring)
            local teststring = "rm " ..snapFile
            print ("RM string: " ..teststring)
            os.execute(teststring)
    end
}

Everything seems to work fine without errors, but unfortunately also without a message coming in via Telegram. The log file looks like this:

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2019-07-18 00:12:41.477 Status: dzVents: WGET: wget -O "/var/tmp/camsnapshot.jpg" "http://123.45.67.89:8088/camsnapshot.jpg?idx=7"
2019-07-18 00:12:41.510 Status: dzVents: POST: curl -s -X POST "https://api.telegram.org/bot122356789:AABBCDEFGHIJKLMNOPQRSTUVWZYZabcdef/sendPhoto?chat_id=987654321" -F photo="@/var/tmp/camsnapshot.jpg"
2019-07-18 00:12:41.725 Status: dzVents: RM: rm /var/tmp/camsnapshot.jpg
2019-07-18 00:12:41.739 Status: dzVents: Info: ------ Finished Doorbellphotoscript

Am I overlooking something? Is there something wrong in the syntax?

BTW the camera I am using is a cheap and simple ESP32CAM model. Typing 'http://123.45.67.89:8088/camsnapshot.jpg?idx=7' in the browser results in the download of a file named 'snapshot.jpg'.

Posted: **Thursday 18 July 2019 7:16**

This is my script. It works for me.
Be sure you have a link that gives an image in your browser, not a download.
I have an axis camera. When having a string that downloads a image, like you have writen. Than it doesn't work.

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return {
    on = { 
       devices = {'Camera voordeur'},
    },

    execute = function(domoticz, device)
        if(device.state == 'On') then
            local teleTok   = 'your token'
            local chatId    = 'your chat ID'
            local snapFile  = '/home/pi/domoticz/scripts/camera_' 			--Location for saving the image
            local camName   = 'Voordeur' 							--The file name for the image
            local domoReq   = 'http://XXX.XXX.XXX.XXX/jpg/1/image.jpg' 	--This is the string for a axis camera
            
            os.execute('wget -O "'..snapFile..camName..'.jpg" "'..domoReq..'"')
            os.execute('curl -s -X POST "https://api.telegram.org/bot'..teleTok..'/sendPhoto?chat_id='..chatId..'" -F photo="@'..snapFile..camName..'.jpg"')
            os.execute("rm " ..snapFile..camName..'.jpg')
        end
    end
}

Posted: **Thursday 18 July 2019 9:44**

pgielen wrote: ↑Thursday 18 July 2019 0:40 Sending a snapshot through Telegram from a camera pointed at my front door when the door bell is pressed seems trivial. I have read several threads about it on the Domoticz forum and tried to brew a dzvents script for it. Unfortunately, with no success (yet).

Did you test the individual steps from the command line ?

What is the result of the wget command ?
Is there an actual image in the jpg file ?
Is there a delay between the execution of the wget command and the creation of the jpg ?
What is the result of the curl command ?
Do you receive anything via telegram after the execution of the curl command ?

Posted: **Saturday 20 July 2019 16:09**

Thanks for your answers. It works now.

There were two problems with my script, actually. One was that the bot token did not work. I don't know why, because when testing it in the Domoticz notification settings it did work. However, I made another bot in Telegram and this does work in the script. It's still a mystery to me why one bot token will work in dzvents and another will not. A peculiarity of Telegram, I guess.

The other problem was that i entered the external url of the camera in Domoticz (seen in the status bar when hovering above the 'Take Snapshot' icon in Setup > More options > Cameras) as the url that should give me a snapshot. It should have been the url in the local network that tells the camera to take a snapshot (in my case 'http://192.168.178.75/capture').

Now, the next challenge will be to rotate the ESP32CAM image 90 degrees clockwise before sending it to Telegram. It's easy in CSS, but can it be done in dzvents?

Pierre

Posted: **Saturday 20 July 2019 18:19**

pgielen wrote: ↑Saturday 20 July 2019 16:09 Now, the next challenge will be to rotate the ESP32CAM image 90 degrees clockwise before sending it to Telegram. It's easy in CSS, but can it be done in dzvents?

Not directly but if you install imagemagick

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sudo apt-get install imagemagick

and give the the command

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convert original.jpg -rotate 90 rotated.jpg

from dzvents, you can

Posted: **Sunday 21 July 2019 9:20**

Thanks for the tip!

Domoticz

Telegram dzvents script for doorbell cam still not working

Telegram dzvents script for doorbell cam still not working

Re: Telegram dzvents script for doorbell cam still not working

Re: Telegram dzvents script for doorbell cam still not working

Re: Telegram dzvents script for doorbell cam still not working

Re: Telegram dzvents script for doorbell cam still not working

Re: Telegram dzvents script for doorbell cam still not working