i2c write works

framework/unit.c

@@ -6,7 +6,7 @@
 #include "unit.h"
 #include "resources.h"
 
-char unit_tmp64[64];
+char unit_tmp512[512];
 
 // Abort partly inited unit
 void clean_failed_unit(Unit *unit)

framework/unit.h

@@ -11,7 +11,8 @@
 #include "utils/payload_builder.h"
 #include "utils/payload_parser.h"
 
-extern char unit_tmp64[64]; // temporary static buffer
+extern char unit_tmp512[512]; // temporary static buffer - not expected to be accessed asynchronously
+// TODO add mutex?
 
 typedef struct unit Unit;
 typedef struct unit_driver UnitDriver;