Troubleshooting

BSB-LAN tries to make accessing your heating system as easy as possible, but there are always things that can go wrong. If you still have a problem after reading this document as well as the FAQ, please open up a bug report on the project's GitHub page and make sure that you provide us with all the necessary log files and further required details, especially from the Serial Monitor (or SerMo in short).
Before doing so, however, make sure that you install the most recent version of BSB-LAN from the master repository (not the release version), even if yours is "just" a few days old. Still, a lot could have happned since then :)!

Using the Serial Monitor

  • Access the Serial Monitor by going to Tools/Serial Monitor in the Arduino IDE.
  • Set the transmission speed to 115200 at the top right corner of the serial monitor window.
  • Make sure you copy the messages right from the moment your microcontroller boots (indicated by the READY message) until the moment you encounter the problem.
  • Please do not send screenshots, only plain text files.

The Serial Monitor in the Arduino IDE currently has a bug that allows you to only copy those parts of the Serial Monitor messages that you can see on the screen. Although this means that copying larger portions of log messages is tedious, you still have to provide the complete log in order to get support. Increasing the size of the Serial Monitor window helps a little.


Compiling fails: "Sketch too big"


No access to web-interface anymore

If you have changed the settings in such a way that you cannot access the web-interface anymore, there are two ways to restore the system:

  • If you can flash the device:
    1. Configure BSB_LAN_config.h with correct, working settings.
    2. Set UseEEPROM to 0.
    3. Flash BSB-LAN onto the microcontroller.
    4. You can now access BSB-LAN. Go to "Settings" and save the settings. This will store the working settings to the EEPROM.
    5. Now edit BSB_LAN_config.h again(!) and set UseEEPROM to 1 and flash BSB-LAN again to the microcontroller.
    6. Only now will BSB-LAN read and use the settings from the EEPROM, so you can make further changes in the web-interface.
  • If you cannot flash the device:
    1. If you cannot flash the device on site, you can reset BSB-LAN to the last BSB_LAN_config.h setting by connecting two pins before and during booting the microcontroller:
      • ESP32-Olimex: Connect pins 34 and 3V3.
      • ESP32-NodeMCU: Connect pins 21 and 3V3.
      • Arduino Due: Connect pins 31 and 33.
    2. If the pins were successfully connected, the built-in LED of the microcontroller will flash slowly for four seconds.
    3. Afterwards open the configuration in the web-interface, check all settings in the configuration and save them. This will store the working settings to the EEPROM.
  • Temporary access point on an ESP32-based microcontroller
    • On an ESP32-based microcontroller, BSB-LAN will set up its own wireless access point named BSB-LAN if it cannot connect to any network. In this casee, you can connect to this access point with the password BSB-LPB-PPS-LAN and access BSB-LAN via the IP address http://192.168.4.1 and see if you can fix the configuration this way. Keep in mind that if you have set a passkey or HTTP username and password, these are still required if these details are stored in EEPROM or BSB_LAN_config.h.

I can only access very few parameters via BSB/LPB!

  • Initially, BSB-LAN only comes with a small set of parameters that work on (almost) every heating system. You need to get a device specific parameter list.

Category list suddenly so small

  • BSB-LAN needs to detect the heating system's controller to determine the categories to display. If BSB-LAN is not connected to the controller or the detection otherwise fails, only a few universal categories are displayed.

Cannot read any parameters / device family is 0

  • Wrong bus type (BSB instead of LPB or vice versa).
  • If the red LED of the adapter is not on (and ideally slightly flickering), there is a problem with the wiring between the adapter and the heating system. The red LED will come one once the adapter is connected correctly, even if the BSB-LAN adapter isn't even connected to the microcontroller!

No data even though the adapter's red LED is on

  • Make sure the adapter is connected to CL+/CL- and not to the third (G+) pin: G+ will drive the LED, but it's not a data line.
  • Make sure you have powered on the microcontroller. You may think that the heating system powers the microcontroller because the LED on the BSB-LAN adapter is on, but it doesn't. You need to power it separately.
  • With the adapter for the Olimex microcontrollers: Make sure that the BSB-LAN adapter board sits exactly in the center of the UEXT connector. It will still fit in, if it's shifted one pin left or right, but it won't work.
  • Make sure the RX/TX pins are set/detected correctly. The startup sequence in the Serial Monitor will show you what pins have are used or have been auto-detected.

No or unreliable network connection

  • Try powering the microcontroller via USB from a laptop. We have had many cases where power supplies were unreliable despite having sufficient ratings.
  • Look at the Serial Monitor log to check if the microcontroller could acquire an IP address. If not, then your network settings or physical connection may be faulty.

No connection to hidden WiFi network possible


Room temperature (or any other parameter) cannot be set


Web-interface freezes when making new connection

  • BSB-LAN is not a multi-tasking system. This means it can attend to one task at a time. So even if a URL command is aborted (by closing the browser window), BSB-LAN might not detect this and only start serving new requests once the previous one is finished.

The Serial Monitor is not showing readable data

  • Make sure the speed is set correctly to 115200 bps.
  • Make sure the correct port is selected.