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More on MQTT

Setup a private mqtt server

https://mosquitto.org/man/mosquitto-conf-5.html

https://medium.com/jungletronics/mosquitto-user-access-configurations-setups-2f95dc593adf

MQTT Servers on the Internet

io.adafruit.com

The convention on topic name is using the username as the root in the topic name like

mathertel/feeds/counter.

mathertel/feeds/counter/csv. mathertel/feeds/counter/json.

https://io.adafruit.com/api/docs/mqtt.htm

Configuration Example

This example shows how to configure this element:

"mqtt": {
  "ada": {
    "server": "mqtts://mathertel:1234-1234-1234-1234@io.adafruit.com:8883",
    "topic": "mathertel/feeds/counter",
    "fingerprint": "59 3C 48 0A B1 8B 39 4E 0D 58 50 47 9A 13 55 60 CC A0 1D AF",
  }
}

{your Adafruit IO username}/feeds/{feed key} {your Adafruit IO username}/feeds/{feed key}/csv {your Adafruit IO username}/feeds/{feed key}/json

arduino.io

The ArduinoIoTCloud library adds an additional leyer upon the mqtt protocol implemented in the ArduinoMqttClient library.

I got the simple examples up and running and extracted some details about the MQTT implementation.

However the server is not supporting small packages and package size probing so the esp8266 memory limitation is breaking the implementation.

Here are some details that you can find using the debug feature in the library (see source code):

MQTT Broker: https://mqtts-up.iot.arduino.cc:8884 (used for id+key) Device ID: adce94ef-1111-2222-3333-b1b9366b4444 (mentioned as BOARD_ID in the created example code) Password: “3DES…PK4” (mentioned as SECRET_DEVICE_KEY in the created example code)

The topics / feeds are named using the pattern

“/a/d/” + + “/e/o” for subscribing. “/a/d/” + + “/e/i” for publishing.

Configuration Example

This example shows how to configure this element:

"mqtt": {
  "xx": {
    "loglevel": "2",
    "server": "https://mqtts-up.iot.arduino.cc:8884",
    "user": "adce94ef-73ed-4386-a7ff-b1b9366b7232",
    "key": "3DEWS9BVSYTH0HGAHPK4",
    "feed": "/a/d/adce94ef-73ed-4386-a7ff-b1b9366b7232/e/i/temp"
  }
}

public.mqtthq.com

This is one of the unsecured MQTT brokers on the internet driven by <controlbits.com> where you can publish and subscribe to values.

MQTTHQ.com works without any account and all data you publish will be visible to anyone who knows the topic name.

Data is not stored on the server so only connected clients will get an update.

More information can be found on https://mqtthq.com.

Configuration Example

This example shows how to configure this element:

"mqtt": {
  "xx": {
    "loglevel": "2",
    "server": "http://public.mqtthq.com:1883",
    "feed": "mathertel/f/temp",
    "user": "",
    "key": ""
  }
},

raspberryPi with mosquitto

"mqtt": {
  "dispi": {
    "loglevel": "2",
    "server": "http://dispi:1883",
    "feed": "outdoor/temp",
    "user": "homesa",
    "key": "Home4mqtt"
  }
}

Node-RED installation

https://nodered.org/docs/getting-started/raspberrypi#running-locally

phrase: “HomeRed”

Running Node-RED install for user pi at /home/pi on raspbian

This can take 20-30 minutes on the slower Pi versions - please wait.

Stop Node-RED ✔ Remove old version of Node-RED ✔ Node option not specified : --node12, --node14, or --node16 Leave existing Node.js : v14.19.1 Npm 6.14.16 Clean npm cache - Install Node-RED core ✔ 2.2.2 Move global nodes to local - Leave existing nodes - Install extra Pi nodes ✔ Add shortcut commands ✔ Update systemd script ✔

You can now start Node-RED with the command node-red-start or using the icon under Menu / Programming / Node-RED Then point your browser to localhost:1880 or http://{your_pi_ip-address}:1880

Started : Wed 13 Apr 2022 07:33:23 PM CEST Finished: Wed 13 Apr 2022 07:36:39 PM CEST

You may want to run node-red admin init to configure your initial options and settings.

Once Node-RED has started, point a browser at http://192.168.2.198:1880 On Pi Node-RED works better with the Firefox or Chrome browser

Use node-red-stop to stop Node-RED Use node-red-start to start Node-RED again Use node-red-log to view the recent log output Use sudo systemctl enable nodered.service to autostart Node-RED at every boot Use sudo systemctl disable nodered.service to disable autostart on boot

To find more nodes and example flows - go to http://flows.nodered.org

https://test.mosquitto.org/

https://www.hivemq.com/

create account get MQTT cluster of a BASIC size good for development hosted on AWS. Data is stored for 3 days.

HiveMQ is providing a command line utility to check / update current values available at https://github.com/hivemq/mqtt-cli.

The HiveMQ company advises to use the pubsub library and there are some hints about using it on the web site.

MQTT Explorer

A Windows application available in the Microsoft Store.

See also

ip:192.168.2.200,mask:255.255.255.0,gw:192.168.2.1
Connected to "KHMH"
TX[110]: 10 6C 00 04 (connect)
  4D 51 54 54
  "MQTT"
  04 C2 00 1E 00 

  24 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 00
  [36] "adce94ef-73ed-4386-a7ff-b1b9366b7232" \0
  24 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 00
  [36] "adce94ef-73ed-4386-a7ff-b1b9366b7232" \0
  14 33 44 45 57 53 39 42 56 53 59 54 48 30 48 47 41 48 50 4B 34 
  [20] "3DEWS9BVSYTH0HGAHPK4"
RX: 20 02 00 00 (CONNACK)

TX[49]: 30 46 00 2D (PUBLISH)
  2F 61 2F 64 2F 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 2F 65 2F 6F
  ".../o"
TX[23]: 9F A2 00 6B 4C 49 42 5F 56 45 52 53 49 4F 4E 03 65 31 2E 36 2E 30 FF 

TX[52]: 82 32 00 01 (subscribe)
  00 2D 2F 61 2F 64 2F 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 2F 65 2F 69 00 
  [45] "/a/d/adce94ef-73ed-4386-a7ff-b1b9366b7232/e/i" (0)

RX: 90 03 00 01 (subAck)
  00 30 9C 01 00 2D 2F 61 2F 64 2F 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 2F 65 2F 69 81 A4 21 78 2D 75 72 6E 3A 75 75 69 64 3A 61 64 63 65 39 34 65 66 2D 37 33 65 64 2D 34 33 38 36 2D 61 37 66 66 2D 62 31 62 39 33 36 36 62 37 32 33 32 22 FB 41 D8 95 1F 71 40 00 00 00 68 74 68 69 6E 67 5F 69 64 03 78 24 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36

TX[52]: 82 32 00 02 (subscribe)
  00 2D 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 65 2F 69 00 
  [45]
RX: 90 03 00 02 00
TX[57]: 82 37 00 03 00 32 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 73 68 61 64 6F 77 2F 69 00 
RX: 90 03 00 03 00

Connected to Arduino IoT Cloud

Thing ID: 224b84c9-7b57-46db-b6f7-9a34b88743b6

TX[54]: 30 4A 00 32 
  2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 73 68 61 64 6F 77 2F 6F
  "/a/t/224b84c9-7b57-46db-b6f7-9a34b88743b6/shadow/o"
TX[22]: 81 A2 00 63 72 3A 6D 03 6D 67 65 74 4C 61 73 74 56 61 6C 75 65 73 

RX: 30 B1 01 00 32 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 73 68 61 64 6F 77 2F 69 84 A4 22 FB 41 D8 95 1B ED 80 00 00 00 67 63 6F 75 6E 74 65 72 06 FB 40 50 C0 00 00 00 00 00 02 FB 40 25 FA E1 40 00 00 00 A2 00 64 74 65 6D 70 02 FB 00 00 00 00 00 00 00 00 A3 00 69 74 7A 5F 6F 66 66 73 65 74 06 FB 40 AC 24 00 00 00 00 00 02 FB 40 BC 20 00 00 00 00 00 A3 00 6C 74 7A 5F 64 73 74 5F 75 6E 74 69 6C 06 FB 40 AC 24 00 00 00 00 00 02 FB 41 D8 D7 73 24 00 00 00
counter set to 10.99
temp set to 0.00
TX[49]: 30 73 00 2D 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 65 2F 6F 
TX[68]: 9F A2 00 67 63 6F 75 6E 74 65 72 02 FA 41 2F D7 0A A2 00 64 74 65 6D 70 02 FA 00 00 00 00 A2 00 69 74 7A 5F 6F 66 66 73 65 74 02 19 1C 20 A2 00 6C 74 7A 5F 64 73 74 5F 75 6E 74 69 6C 02 1A 63 5D CC 90 FF

67 63 6F 75 6E 74 65 72 “counter” 74 65 6d 70 “temp”

TX[2]: C0 00 (Ping Request) RX: D0 00 (Ping Response)

Connected to Arduino IoT Cloud Thing ID: 224b84c9-7b57-46db-b6f7-9a34b88743b6 TX[54]: 30 4A 00 32 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 73 68 61 64 6F 77 2F 6F TX[22]: 81 A2 00 63 72 3A 6D 03 6D 67 65 74 4C 61 73 74 56 61 6C 75 65 73 RX[115]: 84 A3 22 FB 41 D8 95 60 A1 00 00 00 00 67 63 6F 75 6E 74 65 72 02 FB 40 25 FA E1 40 00 00 00 A2 00 64 74 65 6D 70 02 FB 00 00 00 00 00 00 00 00 A3 00 69 74 7A 5F 6F 66 66 73 65 74 06 FB 40 88 F0 00 00 00 00 00 02 FB 40 BC 20 00 00 00 00 00 A3 00 6C 74 7A 5F 64 73 74 5F 75 6E 74 69 6C 06 FB 40 88 F0 00 00 00 00 00 02 FB 41 D8 D7 73 24 00 00 00 counter set to 10.99 temp set to 0.00 TX[49]: 30 73 00 2D 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 65 2F 6F TX[68]: 9F A2 00 67 63 6F 75 6E 74 65 72 02 FA 41 2F D7 0A A2 00 64 74 65 6D 70 02 FA 00 00 00 00 A2 00 69 74 7A 5F 6F 66 66 73 65 74 02 19 1C 20 A2 00 6C 74 7A 5F 64 73 74 5F 75 6E 74 69 6C 02 1A 63 5D CC 90 FF pm open,type:2 0 temp=17.10 TX[49]: 30 3E 00 2D 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 65 2F 6F TX[15]: 9F A2 00 64 74 65 6D 70 02 FA 41 88 CC CD FF TX[2]: C0 00 TX[2]: C0 00 TX[2]: C0 00 TX[2]: C0 00

temp=20.31 TX[49]: 30 3E 00 2D 2F 61 2F 74 2F 32 32 34 62 38 34 63 39 2D 37 62 35 37 2D 34 36 64 62 2D 62 36 66 37 2D 39 61 33 34 62 38 38 37 34 33 62 36 2F 65 2F 6F “0>.-/a/t/224b84c9-7b57-46db-b6f7-9a34b88743b6/e/o” TX[15]: 9F A2 00 64 74 65 6D 70 02 FA 41 A2 7A E1 FF “…dtemp…A.z…”

https://dzone.com/articles/setting-up-your-own-arduino-iot-cloud-server

Sources

https://github.com/arduino-libraries/ArduinoMqttClient/tree/master/examples

https://makoserver.net/tutorials/

npm install node-red-contrib-chartjs

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