Echo communications through Android.

Summary of Smoke

* Aliases. Preserve your contacts.
* Almost zero-dependency software.
* Application lock.
* Argon2id and PBKDF2 key-derivation functions.
* Automatic, oscillatory public-key exchange protocol, via SipHash.
* BSD 3-clause license.
* Completed.
* Content is recorded via authenticated encryption.
* Decentralized. TCP, and UDP multicast and unicast.
* Does not require Internet connectivity.
* Does not require registration. Telephone numbers are