callbacks are now allowed

mission/devices/devicedefinitions/GomspaceDefinitions.h

@@ -16,6 +16,9 @@
 #include <cstdint>
 
 namespace GOMSPACE {
+
+using ChannelSwitchHook = void (*)(uint8_t channel, bool on);
+
 static const uint16_t IGNORE_CHECKSUM = 0xbb0;
 /** The size of the header of a gomspace CSP packet. */
 static const uint8_t GS_HDR_LENGTH = 12;