Using this code without HA - push button control of water heating

[andypnz]

Hi Magnus!

Thank you for this great code repository!

I am trying to set up a push button (via RPi Pico W and LIN bus) to turn on the water heater (Truma Combi 6e) to 'HOT' + a LED, then once the water heater reaches temperature turn it off, and also turn off the LED. I dont have HA in my camper, and I would like to not need to connect to wifi/mqtt either.

I needed to remove this from main1.py as it was causing an error (line 142 in my zip below) log.debug(exception(e))

I have managed to remove the HA requirements (I think!) but I really am not sure how to 'nicely' remove the wifi connection / mqtt requirements?

My main problem is currently the code runs (without needing HA, but connected to wifi), but when I press my button I get this error - so my LIN bus control is not working - and I am not sure why?

%Run -c $EDITOR_CONTENT INFO:connect:Detected micropython 1.19.1 4102 on port: rp2 INFO:main:Normal mode activated - for chance to OS-mode type in terminal:

import os os.remove('run_mode.dat' INFO:main1:Found Raspberry Pico Board, using UART1 for LIN on GPIO 4(tx), 5(rx) INFO:main1:1 INFO:main1:Board LED test INFO:main1:main-loop is running INFO:connect:Try to open wifi and mqtt connection INFO:connect:Credentials found: {'SSID': 'Banana', 'MQTT': '192.168.0.93', 'HOSTNAME': 'arpPico', 'ADC': '0', 'ASL': '0', 'WIFIPW': 'abcdefg', 'UN': 'mqtt_user', 'UPW': 'hijklmn'} INFO:connect:STA connection connected successful {'sta_mac': b'(\xcd\xc1\x07\xb2\xde', 'sta_dns': '8.8.8.8', 'cred_fn': True, 'cred_bak': False, 'run_mode': 1, 'run_mqtt': False, 'sta_txpower': 31, 'port': 'rp2', 'ap_state': 'off', 'python': 'micropython 1.19.1 4102', 'sta_mask': '255.255.255.0', 'sta_ssid': 'Banana', 'sta_channel': 1, 'sta_ip': '192.168.0.46', 'sta_gateway': '192.168.0.1', 'sta_state': 'on'} INFO:mqtt_async:Connecting to ('192.168.0.93', 1883) id=b'e6614864d3731b34' clean=1 INFO:mqtt_async:Connecting to ('192.168.0.93', 1883) id=b'e6614864d3731b34' clean=0 INFO:connect:Wifi connected: 192.168.0.46 INFO:connect:MQTT connected INFO:main1:lin-loop is running INFO:main1:hwc-loop is running INFO:main1:Button pressed INFO:main1:INFO:main1:error1 Task exception wasn't retrieved future: coro= <generator object 'lin_loop' at 20024bb0> Traceback (most recent call last): File "uasyncio/core.py", line 1, in run_until_complete File "main1.py", line 243, in lin_loop File "lin.py", line 278, in loop_serial AttributeError: 'bytes' object has no attribute 'hex' INFO:main1:Received command: current_temp_room payload: 0 INFO:main1:inet-key:current_temp_room value: 0 INFO:main1:Received command: current_temp_water payload: 0 INFO:main1:inet-key:current_temp_water value: 0 Water heater was turned off 5 sec ago, so now lets set it to hot INFO:main1:Water heater is now set to HOT INFO:main1:Received command: energy_mix payload: gas INFO:main1:inet-key:energy_mix value: gas INFO:main1:Received command: target_temp_water payload: 0 INFO:main1:inet-key:target_temp_water value: 0 INFO:main1:Received command: operating_status payload: Off INFO:main1:inet-key:operating_status value: Off INFO:main1:Received command: alive payload: OFF INFO:main1:inet-key:alive value: OFF INFO:main1:Received command: heating_mode payload: off INFO:main1:inet-key:heating_mode value: off INFO:main1:Received command: el_power_level payload: 0 INFO:main1:inet-key:el_power_level value: 0 INFO:main1:Received command: target_temp_room payload: 0 INFO:main1:inet-key:target_temp_room value: 0

Changes made to the code:

1. tools.py - added another LED to PIN_MAP
2. connect.py - added the LED to PIN_MAP, country changed to NZ, turned off my new LED
3. cred.py - returned q = "2.0.2" so it does not update
4. main1.py - here

Here is my full code

[mc0110]

Hi Andy,

AttributeError: 'bytes' object has no attribute 'hex' indicates that the micropython version you are using does not work for us. There is also a notice about this in the README. You have to use one of the current nightly builds, please.

I have debugged your code and reduced it as desired and then tested it in my RV. You can also find the log file attached. Please put the file button_lin.py as main.py on the rp2, then the code will be executed at boot time. button_lin.zip I keep my fingers crossed that you are successful.

If you have any other questions, don't hesitate. If you are satisfied, I would be happy about a sponsorship. You will find the button on the project page.

[andypnz]

Hi Magnus

Thank you! Ahh... I mis-read the documentation and searched for an earlier build of micropython. I will change to a nightly.

And thank you so much - really amazing - I did not expect you to do the code for me!

I will test first thing tomorrow morning and report back

Thanks again!

[mc0110]

Andy,

I thought it would be better if you could be sure that the code works with a TRUMA. So I also noticed that the time between switching off and then switching on the heater is 5 seconds too short. The only problem with testing was that it is winter here and only 4°C in the RV ;-)

But if I have understood correctly, you have not yet had any communication with your TRUMA. In this case, please also note the INIT note in the README. This also applies to your Sw.

[andypnz]

Thanks again - I will be sure to perform the INIT process….

I have the new micropython + your software running on the bench - ready to try in the morning when there is some daylight :-)

[andypnz]

Hi Magnus

Some testing this morning:

1. The registration process did not work when using the button_lin.py (as main.py)
2. Registration does work using the original main.py - so this shows the LIN bus board is working, and there is good communication between the Pico / LIN adaptor / CPplus (B2 - identifier for NAD 03)
3. Using button_lin.py as main - the water heater does not turn on after button press. No errors in the log - so it looks like it should be working - and gets a water temperature (not sure if correct - but looks ok?) - but the heater never turns on.... Any ideas what I can try to trouble shoot this? Maybe somehow related to (1) above? I am using the same hardware - only changing the main.py file....

INFO:main:Found Raspberry Pico Board, using UART1 for LIN on GPIO 4(tx), 5(rx) INFO:main:1 INFO:main:Board LED test INFO:main:lin-loop is running INFO:main:hwc-loop is running INFO:main:Button pressed INFO:main:target_temp_water = 0 INFO:main:Water heater was turned off 5 sec ago, so now lets set it to hot INFO:main:Water heater is now set to HOT INFO:main:Current HWC Temp: 19.0 (I think this number is real?)

BTW, I have setup my logic analyzer - so can grab some captures of the LIN bus data if that is necessary to help solve this :-)

Thank you - I think this is close to working :-)

[andypnz]

Some small update.

If I add lin.loop_serial() to the hwc_loop in button_lin.py (as main.py) registration now works with this code.

So even though lin_loop and hwc_loop should both have been running (?), it looks like lin_loop was not available? I think the answer is in the video here https://www.digikey.bg/en/maker/projects/getting-started-with-asyncio-in-micropython-raspberry-pi-pico/110b4243a2f544b6af60411a85f0437c but I am not sure I am up to understanding this.

This buuton_lin.py allows registration....

Unfortunately still no control - but the water temperature is probably correct ..... and there is weak flashing / flickering of the LED

INFO:main:Found Raspberry Pico Board, using UART1 for LIN on GPIO 4(tx), 5(rx) INFO:main:1 INFO:main:Board LED test INFO:main:lin-loop is running INFO:main:hwc-loop is running INFO:main:Button pressed INFO:main:target_temp_water = 0 INFO:main:Water heater was turned off 5 sec ago, so now lets set it to hot INFO:main:Water heater is now set to HOT INFO:main:Current HWC Temp: 20.0 INFO:main:Current HWC Temp: 20.0

I am using a RPi Pico w - I also tried a ESP32 + 2nd LIN bus / serial adaptor - same results - registration works, temp returns, but no control of the heater.....

Cpplus : C3.00.01 Heater: H5.00.00 inetbox2mqtt: 23.70.0 (I don’t have a real inetbox)

This now looks like the same issue as John https://github.com/mc0110/inetbox2mqtt/issues/25 Receive working, but no transmit?

I can do some logic analyzer captures if you think there is something to learn?

[mc0110]

I don't understand your comments about the uasyncio. The LIN module and the control logic have different time frames. They cannot work together. Since my software example worked here in my RV, it was already clear to me that there must be other reasons for it not working for you. But never mind!

You have already mentioned the parallelism with John's issue! It is very surprising that I now have two users at the same time who have an early CPplus version C3.00.0x and comparable difficulties. I therefore suspect that it is due to the CPplus version.

Since the microPython version of the LIN-module only uses a lightweight state-machine for the control, we can't get any further. It would therefore be helpful if you could test Daniel's raspi version inetbox. If the CPplus works with Daniel's version (it has a different structure, so this is not unrealistic), please write a log file with DEBUG_LIN=1 truma_service and test not only INIT but also the writing of commands.

[mc0110]

New information - you need a CPplus Version C4.03.00. With C3.00.0x it won't be running. Sorry for the bad news!

[andypnz]

Hu Magnus

Thank you - actually, that is good news! We could otherwise spend a long time going no where….

So you think heater firmware 5.00.00 is ok?

I will see what is possible to upgrade the CPplus :-)

Thanks again for all your help - I will let you know how I get on

[mc0110]

My expert said that the new one (CPplus) can communicate with older heating systems, but not vice versa.

[andypnz]

Great! Do you know if a newer CPplus will also work with inetbox2mqtt?

For example on eBay I see C4.04.01 - should that all work as well? They are expensive :-)

[mc0110]

Yes, they will!

[andypnz]

Great - thanks for all your help….

I will order one, and when it arrives let you know how it goes :-) Maybe this also solves the lin_loop / hwc_loop registration difficulty…..

[andypnz]

Hi Magnus

My local RV dealer swapped my version 3.00.00 CPplus for a used 4.03.00 - which was great!

My first issue - I am trying to read the time from the CPplus....

           ` currentTimeString = lin.app.get_status("clock")`

and I get this error:

future: coro= <generator object 'hwc_loop' at 3ffeefe0> Traceback (most recent call last): File "uasyncio/core.py", line 1, in run_until_complete File "", line 178, in hwc_loop File "inetboxapp.py", line 433, in get_status KeyError: clock

Any thoughts on that? Maybe I am using the wrong method here to get the time?

Regarding hot water control: lin.app.set_status("target_temp_water", "60") Turns on the hot water heater as expected, but after a short time it turns off (water temp < 40 degrees). Any idea why it is not staying on? Do I need to also send some other command (like your note regarding room heating)? The CPplus still shows water heating set to 'hot' - but it stops doing that.....

Thank you!

[mc0110]

Hi Andy,

first of all, congratulations that it now works for you too, if that was already clear after John's experience.

About your problems: The time is only transmitted once every minute. If you request it too early, you will get this error, because the key is only created after the time has been transmitted for the first time. The inetbox cannot force this transmission, it is provided by the CPplus.

The transfer protocol between inetbox and CPplus is a buffer transfer. Inetbox2mqtt looks at the individual elements and whenever (but only when) an element has changed, then the buffer with all elements is retransmitted. You can see the transfer in CPplus on the display, where an "APP" appears for 2-3 seconds. You should therefore make sure that you have not set the target_temp_water to "0" again somewhere.

[andypnz]

Thank you, and thank you for your help!

Ok, I will ensure I wait > 60 seconds before asking currentTimeString = lin.app.get_status("clock")

Referring to your button_lin.py - would it be a good idea to do a 60 second time.sleep immediately before e=asyncio.create_task(hwc_loop(buttonReady, manualHWCboost))

Rational: Lin_loop will already be running - so a 60 second sleep here should ensure coms are up and running and the key will be created

I have tested with your button_lin and I see this same behavior of water heater turning off after some 30 seconds or so. I will do some more testing tomorrow - maybe waiting longer after power on will help.... But I don't believe I am incorrectly setting the target_water_temp to "0" again.

[andypnz]

Ok, I added a 60 second sleep after the lin_loop is started but before doing anything else - this fixed the clock issue :-)

And the water heater is working as expected - actually, it was yesterday - but I could not hear it so thought it was turning off (after the initial fan noise) - but letting it run I now see the water temp rising as expected :-)

Thank you for bringing to life a great project!

[mc0110]

Thanks for your sponsorship