* Add metadata field to channels and update things metadata
Add metadata field to channels. Update thing metadata field to be
in JSON format. Update tests..
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
* Add metadata to channel events
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
* Add metadata field to channel in go SDK
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
* Add event sourcing middleware for things service
Add event sourcing for write operations over things and channels.
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
* Add tests for event sourcing middleware
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
* Update things in tests to contain metadata field
Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>