@bearer thank you for the reply.

@dc42 thank you very much for your reply and confirmation.

Hi,
I am new to this forum.
The following points explain my question and what I already find out before posting it here :

• target board : Duet 3 Mainboard 6HC
• looking for firmware modification indications
• I am looking for a way to send an internal variable (e.g. extruder's temperature) regularly in a time period of 50ms (an example value of fast communication) over the Spi port given in the SBC 26 pin header.
• Im aware of the Gcode everywhere philosophy. But I couldnt achieve such high speed communication (continuous probing each 50ms )
• I know that communication over the SBC 26 pin header is activated for g-code based communication, how can I disable it for my own purpose.
• should I add a task in parallel to reprap in the freeRTOS or can I simply add an spi client somewhere ?

Thank you in advance.