Made the Socket mode mandatory [demos]
Made the Socket mode mandatory [demos]


Former-commit-id: ac698ec75e7b9cbd2664c7e14fd4693fd61264d1 [formerly ac698ec75e7b9cbd2664c7e14fd4693fd61264d1 [formerly d96ed900d5739f86fcf23d32410f43366b85986c]]
Former-commit-id: 593927811010ea155eb379630259e5a66dfef340
Former-commit-id: dcca17b377fe62a9b4c408439ae8c764236a5881
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine