Weather skills - Fetch.ai Developer Documentation

The AEA weather skills demonstrate an interaction between two AEAs.

The provider of weather data (the weather_station).
The buyer of weather data (the weather_client).

Discussion

The scope of the specific demo is to demonstrate how to create a simple AEA with the usage of the AEA framework and a database. The weather_station AEA will read data from the database, that is populated with readings from a weather station, based on the requested dates and will deliver the data to the client upon payment. This demo does not utilize a smart contract. As a result, we interact with a ledger only to complete a transaction.

You can use this AEA as an example of how to read data from a database and advertise these to possible clients.

Communication

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

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

Preparation instructions

Dependencies

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

Demo instructions:

A demo to run the same scenario but with a true ledger transaction on Fetch.ai testnet or Ethereum ropsten network. This demo assumes the buyer trusts the seller AEA to send the data upon successful payment.

Create the weather station

First, fetch the AEA that will provide weather measurements:

aea fetch fetchai/weather_station:0.12.0 --alias my_weather_station
cd my_weather_station
aea install

Alternatively, create from scratch.

The following steps create the weather station from scratch:

aea create my_weather_station
cd my_weather_station
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/weather_station:0.11.0
aea install
aea config set agent.default_connection fetchai/p2p_libp2p:0.9.0

In `weather_station/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 the weather client

In another terminal, fetch the AEA that will query the weather station:

aea fetch fetchai/weather_client:0.12.0 --alias my_weather_client
cd my_weather_client
aea install

Alternatively, create from scratch.

The following steps create the weather client from scratch:

aea create my_weather_client
cd my_weather_client
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/weather_client:0.10.0
aea install
aea config set agent.default_connection fetchai/p2p_libp2p:0.9.0

In `my_weather_client/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 weather station AEA

First, create the private key for the weather station 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 weather client AEA

The weather client needs to have some wealth to purchase the service from the weather station.

First, create the private key for the weather client 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 weather client 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 weather station 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 weather client 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 weather client AEA:

aea run

You will see that the AEAs negotiate and then transact using the selected ledger.

Delete the AEAs

When you're done, go up a level and delete the AEAs.

cd ..
aea delete my_weather_station
aea delete my_weather_client

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