[robonomics] sign data and broadcast

[Vourhey]

There is a scenario where we need to broadcast a valuable data over network signed by a private key

There were few cases where we didn't need a whole stack for example:

• https://github.com/Vourhey/sds011_sensor_agent
• https://github.com/Vourhey/libelium_sensor_collector
• https://github.com/Vourhey/uruguay_collector_server
• https://github.com/Vourhey/fuji_weather

In the examples above we didn't need a liability module (and blockchain part in particular) rather we needed IPFS part only

Launching let's say "signer only" would help to run our framework on low performance hardware like Raspberry Pi and similar ones

[akru]

What's about using libp2p PeerId for each message? Every GossipsubMessage has it as source field.

PeerId could be derived by one of the following public keys:

• Ed25519
• RSA
• Secp256k1

https://docs.rs/libp2p/0.17.0/libp2p/identity/enum.PublicKey.html

[akru]

Implemented in pubsub module, each message has sender ID that could be used in pair with the static link to ETH/Polkadot/etc. account.