I don't think Signal has any mesh networking there are other apps like Firechat and Bridgify (haven't used either of them just googling).
As for the mask it'll do a little bit for CS and mace probably with eye protection but the goal is mostly protecting protesters by keeping them from being identified and retaliated against later. It's also way easier to make a buff style covering and it can be worn over many types of filtering masks.
As for the mask it'll do a little bit for CS and mace probably with eye protection but the goal is mostly protecting protesters by keeping them from being identified and retaliated against later. It's also way easier to make a buff style covering and it can be worn over many types of filtering masks.