To get familiar with AIRA, let's see what is under the hood.
Once you launch the client several ros nodes will already be on the run. Here's a list of robonomics communication stack nodes:
$ rosnode list /eth/erc20_token /eth/eth_node /graph/aira_graph /liability/executor /liability/infochan/eth/signer /liability/infochan/ipfs_channel /liability/persistence /liability/listener /rosout
/eth/eth_node- proved services for Ethereum blockchain and ERC20 tokens
/graph/aira_graph- service node for exploring other AIRA instances
/liability/executor- gets rosbag file from IPFS and plays it
/liability/infochan/ipfs_channel- is responsible for offer, demand and result messages. It catches messages from the channel and sends signed messages back
/liability/infochan/eth/signer- offers services for signing offer, demand and result messages
/liability/listener- watches for a new liability contracts. When the event is received the node calls executor node
/liability/persistence- helps to store incoming liabilities and restart them after shutdown
And here's a list of robonomics stack topics.
$ rostopic list /eth/event/approval /eth/event/transfer /graph/greetings /liability/complete /liability/finalized /liability/incoming /liability/infochan/eth/sending/demand /liability/infochan/eth/sending/offer /liability/infochan/eth/sending/result /liability/infochan/eth/signing/demand /liability/infochan/eth/signing/offer /liability/infochan/eth/signing/result /liability/infochan/incoming/demand /liability/infochan/incoming/offer /liability/infochan/incoming/result /liability/persistence/add /liability/persistence/del /liability/persistence/update_timestamp /liability/ready /liability/result /rosout /rosout_agg
The most important topics for us are:
/liability/incoming- when a new liability is created, this topic publishes Ethereum address of the contract
/liability/result- this topic is for publishing results. But don't publish a result directly to this topic! Use a service instead
/liability/infochan/incoming/*- a CPS gets information about offer, demand or result from corresponding topics
/liability/infochan/eth/signing/*- a CPS sends offer, demand or result messages to corresponding topics
For the details check out the API page.
Let's start with greetings - say hello to AIRA!
You should just launch a pre-installed package
$ rosrun hello_aira hello_aira
We've launched our agent. It will wait for a demand message. Now it's time to send the message. Go to dapp and press Order. Now go back to the console and see the result!