Significant updates. Compiles and works, though not test significantly nor assumed to be particularly robust. I2C comms between Raduino and TeensyDSP. Some amount of functioning CAT. Haven't tried with any applications e.g. WSJT-X.

Raduino/ubitx_lcd_nextion.ino

@@ -994,7 +994,9 @@ char checkCountSMeter = 0;
 void idle_process()
 {
   // KC4UPR 2021-02-05 added update process for Raduino-TeensyDSP coordination
-  rigState.update();
+  rigState.send_RIGINF();
+  delay(1);
+  rigState.receive_RIGINF();
   //updateStateFromRaduino(rigState);
   //doRaduinoToTeensy(&rigState);
   //updateRaduinoFromState(rigState);