Transfer images between 2 node red install ( pi - windows )

General
1

Hi!

I am looking for some advice.
I want to send an image from a windows pc to a pi both running node red.
Now i think about ftp to do the transfer or send the data file trough mqtt but i guess that is not ideal

What should you advice to do this? and why so i learn from it :wink:

2

You can use MQTT to send images (just tested it and it worked fine)

3

Depends how much and how often I guess. How large are the images, and at what frequency would you like to send it?

4

I send still images from Pi cameras using MQTT, which works well, though I agree MQTT is not an ideal channel for this. I push the raw image data through a Base-64 encode node before transmission which allows them to be directly displayed on a dashboard on the receiving end with a simple template node. Been doing it this way for a couple of years without any issues.

1 Like
5

serious? thats cool. Thought it would be to much for mqtt

6

Cool i am going to test it, thanks

7

The payload of the message is limited to 268,435,456 bytes. this is defined by the spec.

No problem unless you have some serious imagery :wink:

1 Like
8

can I get the flow of it?? I'm sending an image with base-64 encode but on receiving the same using base64 not able to get the image.

9

What does that mean? The data doesn't arrive at the MQTT broker? The data doesn't arrive in the 2nd node-red? The data arrives but you can't display it in dashboard?

10

I can get the data, Data from both MQTT send and receive have base64 node. At this moment I got the image successfully in the image preview node.

Now I'm not able to see it in the dashboard. I have used a template node for that. but not able to see the image

image
image

11

Thats probably something simple. See the flow in this post, grab the template and ui_template from that.

1 Like
12

Sure!

[
    {
        "id": "c6dd49c3.81e468",
        "type": "tab",
        "label": "Flow 1",
        "disabled": false,
        "info": ""
    },
    {
        "id": "9e351bee.6ede18",
        "type": "ui_template",
        "z": "c6dd49c3.81e468",
        "group": "aff659f4.4b64b",
        "name": "Camera 1",
        "order": 2,
        "width": "6",
        "height": "4",
        "format": "<img src=\"data:image/jpg;base64,{{msg.payload}}\" style=\"display: block; width: 100%;\" />",
        "storeOutMessages": true,
        "fwdInMessages": false,
        "resendOnRefresh": false,
        "templateScope": "local",
        "x": 240,
        "y": 120,
        "wires": [
            []
        ]
    },
    {
        "id": "b28e5d43.133d3",
        "type": "mqtt in",
        "z": "c6dd49c3.81e468",
        "name": "Camera 1",
        "topic": "cameras/1/capture",
        "qos": "2",
        "datatype": "auto",
        "broker": "e929bd47.f54968",
        "x": 80,
        "y": 120,
        "wires": [
            [
                "9e351bee.6ede18"
            ]
        ]
    },
    {
        "id": "79168c78.2df8e4",
        "type": "camerapi-takephoto",
        "z": "c6dd49c3.81e468",
        "filemode": "0",
        "filename": "",
        "filedefpath": "1",
        "filepath": "",
        "fileformat": "jpeg",
        "resolution": "2",
        "rotation": "180",
        "fliph": "0",
        "flipv": "0",
        "brightness": "50",
        "contrast": "0",
        "sharpness": "0",
        "quality": "",
        "imageeffect": "none",
        "exposuremode": "auto",
        "iso": "0",
        "agcwait": "1",
        "awb": "auto",
        "name": "Action",
        "x": 230,
        "y": 60,
        "wires": [
            [
                "2eb733dd.94a95c"
            ]
        ]
    },
    {
        "id": "2eb733dd.94a95c",
        "type": "base64",
        "z": "c6dd49c3.81e468",
        "name": "",
        "x": 380,
        "y": 60,
        "wires": [
            [
                "a0c49073.a2b71"
            ]
        ]
    },
    {
        "id": "a0c49073.a2b71",
        "type": "mqtt out",
        "z": "c6dd49c3.81e468",
        "name": "MQTT",
        "topic": "",
        "qos": "",
        "retain": "",
        "broker": "e929bd47.f54968",
        "x": 530,
        "y": 60,
        "wires": []
    },
    {
        "id": "2568cc5e.548584",
        "type": "inject",
        "z": "c6dd49c3.81e468",
        "name": "Capture",
        "props": [
            {
                "p": "timestamp",
                "v": "",
                "vt": "date"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "cameras/1/capture",
        "payloadType": "str",
        "x": 90,
        "y": 60,
        "wires": [
            [
                "79168c78.2df8e4"
            ]
        ]
    },
    {
        "id": "aff659f4.4b64b",
        "type": "ui_group",
        "z": "",
        "name": "Default",
        "tab": "bcbe7bf2.cf94c8",
        "order": 2,
        "disp": true,
        "width": "6",
        "collapse": false
    },
    {
        "id": "e929bd47.f54968",
        "type": "mqtt-broker",
        "z": "",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "usetls": false,
        "compatmode": true,
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "willTopic": "",
        "willQos": "0",
        "willPayload": ""
    },
    {
        "id": "bcbe7bf2.cf94c8",
        "type": "ui_tab",
        "z": "",
        "name": "Examples",
        "icon": "dashboard",
        "order": 1,
        "disabled": false,
        "hidden": false
    }
]
1 Like