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even if ethernet port is already used on Raspberry you can have multiple devices on an ethernet network., this is the cheapest fastest and more robust solution if you don't want to use ethernet If you have very few data a serial can be enough else solution for longer cables and more robust...

At the end this was similar to the Ariane4 - Ariane5 problem , I migrated that part of code from an older version running on Arduino UNO ( optimized for low memory usage ) with a lot less cell , my bad I didnt check if in the new , more performing with bigger data to manage the code was correct...

Thanks again , PROBLEM SOLVED still puzzled about the behaviour of the compiler

Thanks , I will try as soon I get back to lab , I will also look for other similar problem. scary that compiler throws away code and don't tell anything , not even a warning

Thanks , will try all the suggestion , for the 255 limit packets is already over 255 with 18 board and is working packets = board * 16

to ruled out RAM problem I tried to use a very WIDER matrix to try to exaust system resources board = 8 , both cases run perfectly normal program with int myPackets[ packets ][10]; Memory Usage on Teensy 4.1: FLASH: code:72168, data:12268, headers:8744 free for files:8033284 RAM1...

OUTPUT with board =1 -- program runs correctly (display ok, serial output and canbus output correct) Memory Usage on Teensy 4.1: FLASH: code:71976, data:12268, headers:8936 free for files:8033284 RAM1: variables:38784, code:69272, padding:29032 free for local variables:387200 RAM2...

Environment Arduino IDE 2.3.4 Teensy Loader 1.59 Hardware https://www.skpang.co.uk/collections/teensy/products/teensy-4-1-triple-can-board-with-240x240-ips-lcd with CAN1 and CAN2 terminated and connected when the software load everything works perfectly if the variable Board is 18 or less...