MQTT for Android chat applications / Limiting topic access -


i'm trying create chat application android using mqtt, there limited information on how that.

so far i've set mqtt broker user can listen , publish topics (surely that's not 1 wants in chat applications).

i'm using mosquitto broker , it's listing set of features in it's documentation:

topic access added lines of format:

topic [read|write|readwrite] <topic>

it possible define acls based on pattern substitution within topic. form same topic keyword, using pattern keyword.

pattern [read|write|readwrite] <topic>

the patterns available substition are:

%c match client id of client  %u match username of client

the substitution pattern must text level of hierarchy. pattern acls apply users if "user" keyword has been given.

example:

pattern write sensor/%u/data

allow access bridge connection messages:

pattern write $sys/broker/connection/%c/state

so far thought of doing like: pattern readwrite chat/%u/msg

but limits each user read/write on own topic, , that's not intended behavior.

so question is:

is there way set on-the-fly permissions topics?

how 1 ensure eg in chat between a-b-c there topic a-b-c only a-b-c can read , write on?

not using acl file, mosquitto supports plugin system acls

e.g. https://github.com/jpmens/mosquitto-auth-plug/

this allows store acls in database can updated on fly


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