I have the same problem. With Core or Core2 the CAN Unit is not working. I tried Port B and C (with Bottom/Bottom2). It even blocks CAN communication at my test setup (2 ESP32 development modules with additional SN65HVD230). If I use the same code with an Atom it works. Also the Atom CAN (basically the same as the CAN Unit) works with no problem. I also tried the sample code from m5Stack, doesn't work... The CAN Unit is not the problem. If I hook up a logic analyzer at the connection between Core and CAN Unit the data is fine.

@chriszang and another update. So I am happily working on my CAN receiver sketch and just noticed that I forgot to press the button that grounds INT-output of the mc2515 but the upload still worked. Gave it another try (w/o pressing the button) and it's still working - weird. Then I swapped this COMMU module for my 2nd COMMU Module and here the upload doesn't work. My explanation is that the grounding of the mcp2515 INT-output basically created a short circuit in the transistor that controls this pin and eventually burned it out. Not a big problem for me as a) I am not using interrupts in my sketch b) I have a 2nd COMMU unit I just wanted to warn you guys that grounding the INT output has unintended consequences.

@felmue I think I found the issue; my deepsleep() call was inside a loop. Moving it outside the loop sorted it out.

@ajb2k3 I rewrite the all blocks, but still the error

Hello @Armin_PP the function is here. Line 390. It returns true if USB is connected and false otherwise. Thanks Felix

Hello @purpledread the three buttons at the bottom are emulated by buttons defined on the very edge of the touch screen (which physically goes a bit below the actual screen). Try something like this. Thanks Felix

Hi, I have tried to install the M5StackSDUpdater on my Core2 with no success, can you please point me to the good version that I should use for flashing and any modifications necessary for this model? Thanks Dave

@felmue thank you again. That helps me get organized.

@lesmalave Is it working now? As a test, I just tried to click that link and it did successfully download through the browser and then unzip on my machine.

Hello. Not sure if you managed to get this working yet, but if not, there is a ble library that ships with M5Stack Core2 Arduino install. #include <BLEDevice.h> on my computer this was installed at this location: .//Library/Arduino15/packages/m5stack/hardware/esp32/2.0.3/libraries/BLE/src/BLEDevice.h Hence I did not have to install the package separately. I have implemented a project using this just recently using a variety of BLE technology so confident that it works on at least my copy of Core2. If you go to the docs link from the library link you posted (https://github.com/nkolban/ESP32_BLE_Arduino) you can see that the project has now been directly incorporated into Arduino. The lib version you may have downloaded may be out of date. You can find BLEDevice.h/BLEDevice.cpp on your machine and check against the main Arduino source. Hope this helps?

Hello @macsbug, thank you very much! The workaround described in https://forum.m5stack.com/topic/3262/m5-btna-waspressed-conflicts-with-wifi did solve all my problems (even the second one).

Hello @iamjameshannam do you have a SIM card in your IoT Base CatM module? I did some testing and from within UiFlow it seems that as part of the module initialization (e.g. catmiot = module.get(module.CATMIOT)) an AT+CPIN? command is sent repeatedly (about every 6 seconds) until the module response is +CPIN: READY. Without SIM card the module response is ERROR which means the program flow is blocked forever. Thanks Felix

Hello @Javi check out this post. Thanks Felix

@alexanders thanks to you question, I have now added a paragraph about this to my book which will hopefully get an update by the end of the month!

Hello @simmoe I don't know why it does work with your other products, sorry. I think the UiFlow examples are made for quick testing functionality, e.g. via using Run option, which uses the already existing WiFi connection. But yes, I agree, it probably would make sense to include them in the examples. Thanks Felix

I'm not sure what changed but last year something did and you can only run one instance at a time connected to a controller. If you open a second connection to another controller it does in deed cause problems, which is a pain as I used to run two controllers at a time for testing.

Thank you @felmue I´ll try to use that.