The AEA car-park skills demonstrate an interaction between two AEAs.

  • The carpark_detection AEA provides information on the number of car parking spaces available in a given vicinity.
  • The carpark_client AEA is interested in purchasing information on available car parking spaces in the same vicinity.

Discussion

The full Fetch.ai car park AEA demo is documented in its own repo here. This demo allows you to test the AEA functionality of the car park AEA demo without the detection logic.

It demonstrates how the AEAs trade car park information.

Communication

This diagram shows the communication between the various entities as data is successfully sold by the car park AEA to the client.

sequenceDiagram participant Search participant Car_Data_Buyer_AEA participant Car_Park_AEA participant Blockchain activate Car_Data_Buyer_AEA activate Search activate Car_Park_AEA activate Blockchain Car_Park_AEA->>Search: register_service Car_Data_Buyer_AEA->>Search: search Search-->>Car_Data_Buyer_AEA: list_of_agents Car_Data_Buyer_AEA->>Car_Park_AEA: call_for_proposal Car_Park_AEA->>Car_Data_Buyer_AEA: propose Car_Data_Buyer_AEA->>Car_Park_AEA: accept Car_Park_AEA->>Car_Data_Buyer_AEA: match_accept Car_Data_Buyer_AEA->>Blockchain: transfer_funds Car_Data_Buyer_AEA->>Car_Park_AEA: send_transaction_hash Car_Park_AEA->>Blockchain: check_transaction_status Car_Park_AEA->>Car_Data_Buyer_AEA: send_data deactivate Client_AEA deactivate Search deactivate Car_Park_AEA deactivate Blockchain

Preparation instructions

Dependencies

Follow the Preliminaries and Installation sections from the AEA quick start.

Demo instructions

Create car detector AEA

First, fetch the car detector AEA:

aea fetch fetchai/car_detector:0.12.0
cd car_detector
aea install
Alternatively, create from scratch.

The following steps create the car detector from scratch:

aea create car_detector
cd car_detector
aea add connection fetchai/p2p_libp2p:0.9.0
aea add connection fetchai/soef:0.8.0
aea add connection fetchai/ledger:0.5.0
aea add skill fetchai/carpark_detection:0.11.0
aea install
aea config set agent.default_connection fetchai/p2p_libp2p:0.9.0
In `car_detector/aea-config.yaml` add
default_routing:
  fetchai/ledger_api:0.3.0: fetchai/ledger:0.5.0
  fetchai/oef_search:0.6.0: fetchai/soef:0.8.0

Create car data buyer AEA

Then, fetch the car data client AEA:

aea fetch fetchai/car_data_buyer:0.12.0
cd car_data_buyer
aea install
Alternatively, create from scratch.

The following steps create the car data client from scratch:

aea create car_data_buyer
cd car_data_buyer
aea add connection fetchai/p2p_libp2p:0.9.0
aea add connection fetchai/soef:0.8.0
aea add connection fetchai/ledger:0.5.0
aea add skill fetchai/carpark_client:0.11.0
aea install
aea config set agent.default_connection fetchai/p2p_libp2p:0.9.0
In `car_data_buyer/aea-config.yaml` add
default_routing:
  fetchai/ledger_api:0.3.0: fetchai/ledger:0.5.0
  fetchai/oef_search:0.6.0: fetchai/soef:0.8.0

Add keys for the car data seller AEA

First, create the private key for the car data seller AEA based on the network you want to transact. To generate and add a private-public key pair for Fetch.ai AgentLand use:

aea generate-key fetchai
aea add-key fetchai fetchai_private_key.txt
aea add-key fetchai fetchai_private_key.txt --connection

Add keys and generate wealth for the car data buyer AEA

The buyer needs to have some wealth to purchase the service from the seller.

First, create the private key for the car data buyer AEA based on the network you want to transact. To generate and add a private-public key pair for Fetch.ai AgentLand use:

aea generate-key fetchai
aea add-key fetchai fetchai_private_key.txt
aea add-key fetchai fetchai_private_key.txt --connection

Then, create some wealth for your car data buyer based on the network you want to transact with. On the Fetch.ai AgentLand network:

aea generate-wealth fetchai

Run the AEAs

Run both AEAs from their respective terminals.

First, run the car data seller AEA:

aea run

Once you see a message of the form My libp2p addresses: ['SOME_ADDRESS'] take note of the address.

Then, update the configuration of the car data buyer AEA's p2p connection (in vendor/fetchai/connections/p2p_libp2p/connection.yaml) replace the following:

config:
  delegate_uri: 127.0.0.1:11001
  entry_peers: ['SOME_ADDRESS']
  local_uri: 127.0.0.1:9001
  log_file: libp2p_node.log
  public_uri: 127.0.0.1:9001

where SOME_ADDRESS is replaced accordingly.

Then run the buyer AEA:

aea run

You will see that the AEAs negotiate and then transact using the Fetch.ai testnet.

Cleaning up

When you're finished, delete your AEAs:

cd ..
aea delete car_detector
aea delete car_data_buyer