c++filt _ZN4Json5ValueC1ENS_9ValueTypeE
Json::Value::Value(Json::ValueType)
没有加动态链接库，加上
target_link_libraries(${PROJECT_NAME} jsoncpp
)
lib//libNet2LocalNodelet.so: undefined symbol: _ZN11mqtt_client16Net2LocalNodelet23heartbeat_MQTT_callbackERKN5boost10shared_ptrIKN8std_msgs7String_ISaIvEEEEE)
c++filt _ZN11mqtt_client16Net2LocalNodelet23heartbeat_MQTT_callbackERKN5boost10shared_ptrIKN8std_msgs7String_ISaIvEEEEE)
bash: syntax error near unexpected token `)'
原因：C++ 定义的函数没有实现。
