Testing error on new device

[Lacitis36]

Candle Manager installed correctly.
Candle Receiver installed correctly.
Up to there everything works OK.
Created a "temperature and more" device.

When installing the new device, the process stops at testing with an error message.
If I disable the "MySensors" add-on, there is no error but then the device is not recognized at the "things" / "add" phase.

2021-02-28 13:20:47.589 INFO   : Candle-manager-addon: /home/pi/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-objcopy -O ihex -R .eeprom /tmp/arduino-sketch-A573221F682C7F3D9043B705672177CD/Temperature_and_more.ino.elf /tmp/arduino-sketch-A573221F682C7F3D9043B705672177CD/Temperature_and_more.ino.hex
2021-02-28 13:20:47.591 INFO   : Candle-manager-addon: Using library MySensors at version 2.3.2 in folder: /home/pi/Arduino/libraries/MySensors 
2021-02-28 13:20:47.593 INFO   : Candle-manager-addon: Using library SPI at version 1.0 in folder: /home/pi/.arduino15/packages/arduino/hardware/avr/1.8.3/libraries/SPI 
2021-02-28 13:20:47.604 INFO   : Candle-manager-addon: Using library Grove_-_Barometer_Sensor_BME280 at version 1.0.2 in folder: /home/pi/Arduino/libraries/Grove_-_Barometer_Sensor_BME280 
2021-02-28 13:20:47.605 INFO   : Candle-manager-addon: Using library Wire at version 1.0 in folder: /home/pi/.arduino15/packages/arduino/hardware/avr/1.8.3/libraries/Wire 
2021-02-28 13:20:47.608 INFO   : Candle-manager-addon: Using library SoftwareSerial at version 1.0 in folder: /home/pi/.arduino15/packages/arduino/hardware/avr/1.8.3/libraries/SoftwareSerial 
2021-02-28 13:20:47.610 INFO   : Candle-manager-addon: /home/pi/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-size -A /tmp/arduino-sketch-A573221F682C7F3D9043B705672177CD/Temperature_and_more.ino.elf
2021-02-28 13:20:47.612 INFO   : Candle-manager-addon: Sketch uses 27050 bytes (88%) of program storage space. Maximum is 30720 bytes.
2021-02-28 13:20:47.614 INFO   : Candle-manager-addon: Global variables use 1188 bytes (58%) of dynamic memory, leaving 860 bytes for local variables. Maximum is 2048 bytes.
2021-02-28 13:20:47.615 INFO   : Candle-manager-addon: 
2021-02-28 13:20:47.618 INFO   : Candle-manager-addon: 
2021-02-28 13:20:47.620 INFO   : Candle-manager-addon: Command success
2021-02-28 13:20:47.624 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:47] "�[37mGET /compile/10 HTTP/1.1�[0m" 200 -
2021-02-28 13:20:47.630 INFO   : Candle-manager-addon: Port to test upload to:/dev/ttyUSB0
2021-02-28 13:20:47.633 INFO   : Candle-manager-addon: Doing a test upload of the Candle Cleaner
2021-02-28 13:20:47.636 INFO   : Candle-manager-addon: Initial bootloader value: :cpu=atmega328
2021-02-28 13:20:47.638 INFO   : Candle-manager-addon: Uploading
2021-02-28 13:20:47.641 INFO   : Candle-manager-addon: bootloader parameter = :cpu=atmega328
2021-02-28 13:20:47.643 INFO   : Candle-manager-addon: Code name: Candle_cleaner
2021-02-28 13:20:47.647 INFO   : Candle-manager-addon: path to upload from: /home/pi/.webthings/data/Candle-manager-addon/code/Candle_cleaner
2021-02-28 13:20:47.649 INFO   : Candle-manager-addon: Arduino CLI upload command = /home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli upload -p /dev/ttyUSB0 --fqbn arduino:avr:nano:cpu=atmega328 /home/pi/.webthings/data/Candle-manager-addon/code/Candle_cleaner
2021-02-28 13:20:47.652 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:47] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:48.071 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:48.449 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: I just blinked my LED
2021-02-28 13:20:48.451 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:48.621 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.039 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.619 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.862 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Hello
2021-02-28 13:20:49.864 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:49.865 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Starting memory wipe.
2021-02-28 13:20:49.866 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:50.045 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:50] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:50.622 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:50] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:51.086 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:51] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:51.623 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:51] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:51.969 INFO   : Candle-manager-addon: Error during Upload: uploading error: uploading error: exit status 1
2021-02-28 13:20:51.972 INFO   : Candle-manager-addon: first test result:{'success': False, 'message': 'Upload failed', 'errors': ['Error during Upload: uploading error: uploading error: exit status 1']}
2021-02-28 13:20:51.973 INFO   : Candle-manager-addon: success:False
2021-02-28 13:20:51.975 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:51] "�[37mPOST /test_upload/10 HTTP/1.1�[0m" 200 -
2021-02-28 13:20:52.034 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: �e
2021-02-28 13:20:52.056 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:52.057 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Starting memory wipe.
2021-02-28 13:20:52.059 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:52.060 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Hello
2021-02-28 13:20:52.062 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:52.063 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Starting memory wipe.
2021-02-28 13:20:52.064 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:52.066 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:52] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:52.625 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:52] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:53.062 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:53] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:53.627 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:53] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:54.061 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:54] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:54.632 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:54] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:55.066 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:55] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -

[Lacitis36]

With the "MySensors" add-on disabled during install, the sketch is uploaded correctly and the device works as a standalone with the screen showing correct information. But there's no way to get it recognized in "Things".
After many reboots and re-install and using twice brand new RF-NANOs, the "Things" phase recognized some kind of "generic" "Candle Manager" with no associated functions.

Have you followed the steps online? https://www.candlesmarthome.com/candle-manager-tutorial

It seems MySensors is interfering. That usually happens if it's trying to find the Candle Receiver. Are you sure that's plugged in?

0. If you don't have the candle Receiver yet, disable MySensors.
1. create the candle receiver. Leave it in your usb port.
2. enable mysensors. It will link with your Candle receiver, and won't interfere with other devices you plug in.
3. plug in other devices you want to upload code to.

Don't leave secondary devices plugged in to power them after they are made. That may confuse MySensors, as it won't be sure which one to link with when it starts up.

[Lacitis36]

Restarted everything from blank slate following as previously the instructions step-by-step. Downloaded a new image, burned it in, skipped the creation of the web things account, configured the network and checked it works, added the Candle add on and not yet the MySensors, used the sudo chmod +x /home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli command to avoid hitting some permission wall, connected a clean RF-Arduino Nano to the Pi, no other device connected in anyway, no SSH, no DNC running. Clicked on the « Candle Receiver » button. Left all the checkboxes the way they are by default. And now, it tells me that the compiling failed: 2021-03-01 15:06:21.272 INFO : Candle-manager-addon: Compiling: Candle_receiver 2021-03-01 15:06:21.274 INFO : Candle-manager-addon: command = /home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli compile -v --fqbn arduino:avr:nano /home/pi/.webthings/data/Candle-manager-addon/code/Candle_receiver 2021-03-01 15:06:22.209 ERROR : Candle-manager-addon: 192.168.1.119 - - [01/Mar/2021 15:06:22] "[37mGET /scanUSB HTTP/1.1[0m" 200 - 2021-03-01 15:06:23.210 ERROR : Candle-manager-addon: 192.168.1.119 - - [01/Mar/2021 15:06:23] "[37mGET /compile/4 HTTP/1.1[0m" 200 - I may give it one more try but it starts feeling like a waste of time.

…

Le 28 févr. 2021 à 21:42, Candle - the privacy friendly smart home ***@***.***> a écrit : Have you followed the steps online? https://www.candlesmarthome.com/candle-manager-tutorial <https://www.candlesmarthome.com/candle-manager-tutorial> It seems MySensors is interfering. That usually happens if it's trying to find the Candle Receiver. Are you sure that's plugged in? If you don't have the candle Receiver yet, disable MySensors. create the candle receiver. Leave it in your usb port. enable mysensors. It will link with your Candle receiver, and won't interfere with other devices you plug in. plug in other devices you want to upload code to. Don't leave secondary devices plugged in to power them after they are made. That may confuse MySensors, as it won't be sure which one to link with when it starts up. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AS7GBISMKRRI4RGSVX36W6DTBKTEHANCNFSM4YLB47BA>.

You did it perfectly (and the permission issue has been fixed). And those error aren't really errors.

Didn't it work? If not, could you share the full log? Because this snippet doesn't contain any errors.

[Lacitis36]

Nope. It gave me a nice compilation failed message on the Candle Manager screen. I copied the logs just for info. Ph. Masson

…

Le 1 mars 2021 à 16:41, Candle - the privacy friendly smart home ***@***.***> a écrit :  You did it perfectly. And those error aren't really errors. Didn't it work? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

I'll try a fresh install here, see if I run into anything.

I think I found something.

/home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli lib install "Grove_-_Barometer_Sensor_BME280"
Error resolving dependencies for Grove_-_Barometer_Sensor_BME280: looking for library: library Grove_-_Barometer_Sensor_BME280 not found

This library is required for the temperature and more sensor. The script to pre-download some libraries had _ in the title, which shouldn't be there. I've removed them.

Then the library loads ok:

/home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli lib install "Grove - Barometer Sensor BME280"
Grove - Barometer Sensor BME280 depends on Grove - Barometer Sensor BME280@1.0.2
Downloading Grove - Barometer Sensor BME280@1.0.2...
Grove - Barometer Sensor BME280@1.0.2 downloaded                                                                                                                                    
Installing Grove - Barometer Sensor BME280@1.0.2...
Installed Grove - Barometer Sensor BME280@1.0.2

I didn't try to upload code beforehand, so I'm not 100 sure that was the culprit. But I tried an upload to a RFNano of the Temperature and more device, and it worked. I'm creating a new release (1.2.0) that should soon be available.

// Hmm, wait, you mentioned the candle receiver already giving an error while uploading. That's very odd. It doesn't have any dependencies other than MySensors itself.

I'm looking through your earlier logs a bit closer.

2021-02-28 13:20:47.649 INFO   : Candle-manager-addon: Arduino CLI upload command = /home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli upload -p /dev/ttyUSB0 --fqbn arduino:avr:nano:cpu=atmega328 /home/pi/.webthings/data/Candle-manager-addon/code/Candle_cleaner
2021-02-28 13:20:47.652 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:47] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:48.071 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:48.449 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: I just blinked my LED
2021-02-28 13:20:48.451 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:48.621 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.039 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.619 ERROR  : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 -
2021-02-28 13:20:49.862 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Hello
2021-02-28 13:20:49.864 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)
2021-02-28 13:20:49.865 ERROR  : mysensors-adapter: Error decoding message from gateway, bad data received: Starting memory wipe.
2021-02-28 13:20:49.866 ERROR  : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0)

That was a classic case of MySensors already being enabled before the candle receiver is made and plugged in. But since MySensors is disabled, that won't be the problem this time.

Would you be willing to enable debugging in the addon settings, try again, and share the logs? It will create a lot of log data, but it will likely help me find the issue.

[Lacitis36]

As mentioned earlier, I got a clean install and didn’t even yet install the MySensor add-on. What you put in your next message is interesting as, when I got the receiver functioning OK, the next « thing » I made was a 'temperature and more’ using the BME280 sensor (thus the library). No problem to send you the all log. Thanks for your reactivity. Now I must take care of my family and I may get back to it only tomorrow night.

…

Le 1 mars 2021 à 17:54, Candle - the privacy friendly smart home ***@***.***> a écrit : I'm looking through your earlier logs a bit closer. 2021-02-28 13:20:47.649 INFO : Candle-manager-addon: Arduino CLI upload command = /home/pi/.webthings/addons/Candle-manager-addon/arduino-cli/linux-armv7/arduino-cli upload -p /dev/ttyUSB0 --fqbn arduino:avr:nano:cpu=atmega328 /home/pi/.webthings/data/Candle-manager-addon/code/Candle_cleaner 2021-02-28 13:20:47.652 ERROR : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:47] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 - 2021-02-28 13:20:48.071 ERROR : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 - 2021-02-28 13:20:48.449 ERROR : mysensors-adapter: Error decoding message from gateway, bad data received: I just blinked my LED 2021-02-28 13:20:48.451 ERROR : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0) 2021-02-28 13:20:48.621 ERROR : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:48] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 - 2021-02-28 13:20:49.039 ERROR : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 - 2021-02-28 13:20:49.619 ERROR : Candle-manager-addon: 192.168.1.119 - - [28/Feb/2021 13:20:49] "�[37mGET /scanUSB HTTP/1.1�[0m" 200 - 2021-02-28 13:20:49.862 ERROR : mysensors-adapter: Error decoding message from gateway, bad data received: Hello 2021-02-28 13:20:49.864 ERROR : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0) 2021-02-28 13:20:49.865 ERROR : mysensors-adapter: Error decoding message from gateway, bad data received: Starting memory wipe. 2021-02-28 13:20:49.866 ERROR : mysensors-adapter: Not a valid message: not enough values to unpack (expected 5, got 0) That was a classic case of MySensors already being enabled before the candle receiver is made and plugged in. Are you sure MySensors is disabled this time? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AS7GBIX5ELRKBA4TRDA4YV3TBPBGDANCNFSM4YLB47BA>.

Ah, glad to hear that you managed to get the Candle receiver working :-)

By tomorrow you will hopefully have the new version on your system. Have a good evening.

[Lacitis36]

Well that was yesterday. Today with the new install, I got the « compilation failure ». We’ll get there. I’m a patient one. Have a nice evening

…

Le 1 mars 2021 à 18:22, Candle - the privacy friendly smart home ***@***.***> a écrit : Ah, glad to hear that you managed to get the Candle receiver working :-) By tomorrow you will hopefully have the new version on your system. Have a good evening. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AS7GBIRQVRUIWLH64D3BLTTTBPEMLANCNFSM4YLB47BA>.

[Lacitis36]

Created the receiver. It compiled and uploaded but there was no feedback on the USB (nothing appeared in the « listen to the device » box). Installed the MySensor add-on. When going to the Thing page it proposed me a « candle manager » But not the Candle Receiver I was able to create yesterday (with the reception info). So I erased the Thing and restarted the whole process. And now, it doesn’t want to work though I disabled MySensors to do so. More tomorrow. I’m fed up for now.

…

Le 1 mars 2021 à 18:22, Candle - the privacy friendly smart home ***@***.***> a écrit : Ah, glad to hear that you managed to get the Candle receiver working :-) By tomorrow you will hopefully have the new version on your system. Have a good evening. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AS7GBIRQVRUIWLH64D3BLTTTBPEMLANCNFSM4YLB47BA>.

[Lacitis36]

RECEIVER Eventually: success. I cleared the EEPROM of a Nano to be sure to start clean. Followed again the steps and got there. This is where I got yesterday. Now I’ll try with the « temperature and more ». Tell me how I can send you the data: just the log from Webthings? TEMPERATURE AND MORE Unplugging the receiver and plugging in the « temperature and more » Now again, with the « temperature and more » I get an error message at the « testing » phase (see below). The MySensors is on. Does it mean it has to be disabled with each new thing? I’ll try this now (instructions are not mentioning the disabling - just for the receiver creation) and now it works. This is also how I got there yesterday. And getting the right messages: LCD screen shows the right information. Just that the pressure based forecast stays at « unknown » though I left all buttons on default (including the 60 second refreshing - and I can see that indeed the LCD screen refreshes every 60 seconds). So now, re enabling MySensors and going for the « thing » menu and (+). And the result is: No new things found. Try adding some add-ons <http://gateway.local/settings/addons>. Add by URL… <http://gateway.local/things#> Disabling MySensors and the result is: No new things found. Try adding some add-ons <http://gateway.local/settings/addons>. Add by URL… <http://gateway.local/things#> Trying changing physical USB port, changing cable, the result stays the same. I’m stuck at the same point as yesterday.

…

Le 1 mars 2021 à 18:22, Candle - the privacy friendly smart home ***@***.***> a écrit : Ah, glad to hear that you managed to get the Candle receiver working :-) By tomorrow you will hopefully have the new version on your system. Have a good evening. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AS7GBIRQVRUIWLH64D3BLTTTBPEMLANCNFSM4YLB47BA>.

just the internal log from the webthings gateway would be great.

But not the Candle Receiver I was able to create yesterday (with the reception info).

The receiver itself might not show up as a thing until mysensors is enabled again. Once the receiver is created, enable mysensors.

The MySensors is on. Does it mean it has to be disabled with each new thing?

No, this is only necessary when you're starting out. Once the receiver is created and is plugged in, you can start MySensors, and it will connect to the receiver. Then you can start creating more devices.

Unplugging the receiver and plugging in the « temperature and more »

Don't unplug the receiver. Once it's created, just leave it in there.

Just that the pressure based forecast stays at « unknown »

it will take a while before it has enough pressure readings to make a weather prediction.

Add by URL… http://gateway.local/things#

That's not relevant for Candle.