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Mainflux IoT Agent

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Mainflux IoT Agent is a communication, execution and SW management agent for Mainflux system.

Install

Get the code:

go get github.com/mainflux/agent
cd $GOPATH/github.com/mainflux/agent

Make:

make

Usage

Get Nats server and start it, by default it starts on port 4222

go get github.com/nats-io/gnatsd
gnatsd

Create gateway configuration with Provision service or through Mainflux UI.

Start Agent with:

MF_AGENT_BOOTSTRAP_ID=<bootstrap_id> \
MF_AGENT_BOOTSTRAP_KEY=<bootstrap_key> \
MF_AGENT_BOOTSTRAP_URL=https://mainflux.com/things/bootstrap \
build/mainflux-agent

or,if Mainflux UI is used,

MF_AGENT_BOOTSTRAP_ID=<bootstrap_id> \
MF_AGENT_BOOTSTRAP_KEY=<bootstrap_key> \
MF_AGENT_BOOTSTRAP_URL=https://mainflux.com/bootstrap/things/bootstrap \
build/mainflux-agent

Config

Agent configuration is kept in config.toml if not otherwise specified with env var.

Example configuration:

[Agent]

  [Agent.channels]
    control = ""
    data = ""

  [Agent.edgex]
    url = "http://localhost:48090/api/v1/"

  [Agent.log]
    level = "info"

  [Agent.mqtt]
    ca_path = "ca.crt"
    cert_path = "thing.crt"
    mtls = false
    password = ""
    priv_key_path = "thin.key"
    qos = 0
    retain = false
    skip_tls_ver = false
    url = "localhost:1883"
    username = ""

  [Agent.server]
    nats_url = "localhost:4222"
    port = "9000"

Environment:

Variable Description Default
MF_AGENT_CONFIG_FILE Location of configuration file config.toml
MF_AGENT_LOG_LEVEL Log level info
MF_AGENT_EDGEX_URL Edgex base url http://localhost:48090/api/v1/
MF_AGENT_MQTT_URL MQTT broker url localhost:1883
MF_AGENT_HTTP_PORT Agent http port 9000
MF_AGENT_BOOTSTRAP_URL Mainflux bootstrap url http://localhost:8202/things/bootstrap
MF_AGENT_BOOTSTRAP_ID Mainflux bootstrap id
MF_AGENT_BOOTSTRAP_KEY Mainflux boostrap key
MF_AGENT_BOOTSTRAP_RETRIES Number of retries for bootstrap procedure 5
MF_AGENT_BOOTSTRAP_SKIP_TLS Skip TLS verification for bootstrap true
MF_AGENT_BOOTSTRAP_RETRY_DELAY_SECONDS Number of seconds between retries 10
MF_AGENT_CONTROL_CHANNEL Channel for sending controls, commands
MF_AGENT_DATA_CHANNEL Channel for data sending
MF_AGENT_ENCRYPTION Encryption false
MF_AGENT_NATS_URL Nats url nats://localhost:4222
MF_AGENT_MQTT_USERNAME MQTT username, Mainflux thing id
MF_AGENT_MQTT_PASSWORD MQTT password, Mainflux thing key
MF_AGENT_MQTT_SKIP_TLS Skip TLS verification for MQTT true
MF_AGENT_MQTT_MTLS Use MTLS for MQTT false
MF_AGENT_MQTT_CA Location for CA certificate for MTLS ca.crt
MF_AGENT_MQTT_QOS QoS 0
MF_AGENT_MQTT_RETAIN MQTT retain false
MF_AGENT_MQTT_CLIENT_CERT Location of client certificate for MTLS thing.cert
MF_AGENT_MQTT_CLIENT_PK Location of client certificate key for MTLS thing.key
MF_AGENT_HEARTBEAT_INTERVAL Interval in which heartbeat from service is expected 30s
MF_AGENT_TERMINAL_SESSION_TIMEOUT Timeout for terminal session 30s

Here thing is a Mainflux thing, and control channel from channels is used with req and res subtopic (i.e. app needs to PUB/SUB on /channels/<control_channel_id>/messages/req and /channels/<control_channel_id>/messages/res).

Sending commands to other services

You can send commands to other services that are subscribed on the same Nats server as Agent.
Commands are being sent via MQTT to topic:

  • channels/<control_channel_id>/messages/services/<service_name>/<subtopic>

when messages is received Agent forwards them to Nats on subject:

  • commands.<service_name>.<subtopic>.

Payload is up to the application and service itself.

Example of on command can be:

mosquitto_pub -u <thing_id> -P <thing_key> -t channels/<control_channel_id>/messages/services/adc -h <mqtt_host> -p 1883  -m  "[{\"bn\":\"1:\", \"n\":\"read\", \"vs\":\"temperature\"}]"

Heartbeat service

Services running on the same host can publish to heartbeat.<service-name>.<service-type> a heartbeat message.
Agent will keep a record on those service and update their live status. If heartbeat is not received in 10 sec it marks it offline. Upon next heartbeat service will be marked online again.

To check services that are currently registered to agent you can:

curl -s -S X GET http://localhost:9000/services
[
  {
    "name": "duster",
    "last_seen": "2020-04-28T18:06:56.158130519+02:00",
    "status": "offline",
    "type": "test",
    "terminal": 0
  },
  {
    "name": "scrape",
    "last_seen": "2020-04-28T18:06:39.58849766+02:00",
    "status": "offline",
    "type": "test",
    "terminal": 0
  }
]

Or you can send a command via MQTT to Agent and receive response on MQTT topic like this:

In one terminal subscribe for result:

mosquitto_sub -u <thing_id> -P <thing_key> -t channels/<control_channel_id>/messages/req -h <mqtt_host> -p 1883  

In another terminal publish request to view the list of services:

mosquitto_pub -u <thing_id> -P <thing_key> -t channels/<control_channel_id>/messages/req -h <mqtt_host> -p 1883  -m  '[{"bn":"1:", "n":"config", "vs":"view"}]'  

Check the output in terminal where you subscribed for results. You should see something like:

[
  {
    "bn": "1",
    "n": "view",
    "t": 1588091188.8872917,
    "vs": "[{\"name\":\"duster\",\"last_seen\":\"2020-04-28T18:06:56.158130519+02:00\",\"status\":\"offline\",\"type\":\"test\",\"terminal\":0},{\"name\":\"scrape\",\"last_seen\":\"2020-04-28T18:06:39.58849766+02:00\",\"status\":\"offline\",\"type\":\"test\",\"terminal\":0}]"
  }
]

How to save config via agent

Agent can be used to send configuration file for the Export service from cloud to gateway via MQTT.
Here is the example command:

mosquitto_pub -u <thing_id> -P <thing_key> -t channels/<control_channel_id>/messages/req -h localhost -p 1883  -m  "[{\"bn\":\"1:\", \"n\":\"config\", \"vs\":\"<config_file_path>, <file_content_base64>\"}]"
  • <config_file_path> - file path where to save contents
  • <file_content_base64> - file content, base64 encoded marshaled toml.

Here is an example how to make payload for the command:

b,_ := toml.Marshal(export.Config)
payload := base64.StdEncoding.EncodeToString(b)

Example payload:

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Apache-2.0

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