"Can´t convert NoneType to int" issue

[RoToR]

Hello,

I am working on a simple program.

I receive a value between 0 and 1000 by MQTT and convert it to a digital value from 0 to 255.
Then I want to put it on the DAC channel 0.

But if I want to proceed with the digital value within the main loop I get the error "Can´t convert NoneType to int".

I understand that this is a NoneType, which can´t convert into an integer, but I need to work with the digital value in the main loop, because I have to do some calculations (filtering), which is not possible in the MQTT function.

How can I solve this issue?

[RoToR]

I found a workaround meanwhile with if-else.

It is not nice, but it´s working:

• I convert the DAC Value into a String.

• Then I check, if it is "None", if yes I send a 0 to the DAC.

• If DAC Value is not "None" I convert it back to integer and send it directly to the DAC.

[ajb2k3]

Are you using a “convert to int” block to convert the value being sent to the dac?