add ShmSocket as shm interface, add sub/pub.

lichao

2021-03-30 491d98b3ba32cafed5682552bd870ca0ef93275c

 src/defs.h

@@ -27,6 +27,12 @@
const MQId kBHBusQueueId = boost::uuids::string_generator()("01234567-89ab-cdef-8349-1234567890ff");
const int kBHCenterPort = 24287;
const char kTopicSep = '.';
namespace bhome_shm {
class SharedMemory;
}

bhome_shm::SharedMemory &BHomeShm();

//TODO center can check shm for previous crash.

#endif // end of include guard: DEFS_KP8LKGD0