Unable to receive 2 information

[MJ]

Hi there, i am new to lopy as well. Currently i wish to get the information from 2 (lopy+expansion board) to received by the another (lopy+pytrack board) but i only manage to received only 1 information.

For Lopy+Pytrack Board (For receiving information)

For Lopy+Expansion Board (transmit information)

For Lopy + Expansion Board (Transmit information)

• i using IF statement but yet i only can received the 1 information instead of 2 information provided the first IF statement is true.
• i also tried to make it as comment for the either 1 of the receiving 'D' or 'E' it can only show the information that i want. (also displaying 1 information)
• i also use ELIF statement but it cannot received any things.

Result :

1. Running full coding :
   

2. Running with only Lopy+Expansion (power up for B where only B connected) :
   

3. Running with only Lopy+Expansion (power up for C where only C connected) :
   

4. Running only C with the "#' of B :
   

May i know how can i solve this kind of problem? I have struggle for weeks to try out this and that but still in vain. Thanks in advance. :)