# OPC-UA Adapter
Adapter between Mainflux IoT system and an OPC-UA Server.

This adapter sits between Mainflux and an OPC-UA server and just forwards the messages from one system to another.

OPC-UA Server is used for connectivity layer and the data is pushed via this adapter service to Mainflux, where it is persisted and routed to other protocols via Mainflux multi-protocol message broker. Mainflux adds user accounts, application management and security in order to obtain the overall end-to-end OPC-UA solution.

## Configuration

The service is configured using the environment variables presented in the
following table. Note that any unset variables will be replaced with their
default values.

| Variable                         | Description                            | Default                    |
|----------------------------------|----------------------------------------|----------------------------|
| MF_OPCUA_ADAPTER_HTTP_PORT       | Service HTTP port                      | 8180                       |
| MF_OPCUA_ADAPTER_LOG_LEVEL       | Service Log level                      | error                      |
| MF_NATS_URL                      | NATS instance URL                      | nats://localhost:4222      |
| MF_OPCUA_ADAPTER_INTERVAL_MS     | OPC-UA Server Interval in milliseconds | 1000                       |
| MF_OPCUA_ADAPTER_POLICY          | OPC-UA Server Policy                   |                            |
| MF_OPCUA_ADAPTER_MODE            | OPC-UA Server Mode                     |                            |
| MF_OPCUA_ADAPTER_CERT_FILE       | OPC-UA Server Certificate file         |                            |
| MF_OPCUA_ADAPTER_KEY_FILE        | OPC-UA Server Key file                 |                            |
| MF_OPCUA_ADAPTER_ROUTE_MAP_URL   | Route-map database URL                 | localhost:6379             |
| MF_OPCUA_ADAPTER_ROUTE_MAP_PASS  | Route-map database password            |                            |
| MF_OPCUA_ADAPTER_ROUTE_MAP_DB    | Route-map instance name                | 0                          |
| MF_THINGS_ES_URL                 | Things service event source URL        | localhost:6379             |
| MF_THINGS_ES_PASS                | Things service event source password   |                            |
| MF_THINGS_ES_DB                  | Things service event source DB         | 0                          |
| MF_OPCUA_ADAPTER_EVENT_CONSUMER  | Service event consumer name            | opcua                      |

## Deployment

The service itself is distributed as Docker container. Check the [`opcua-adapter`](https://github.com/mainflux/mainflux/blob/master/docker/addons/opcua-adapter/docker-compose.yml#L29-L53) service section in 
docker-compose to see how service is deployed.

To start the service outside of the container, execute the following shell script:

```bash
# download the latest version of the service
git clone https://github.com/mainflux/mainflux

cd mainflux

# compile the opcua-adapter
make opcua

# copy binary to bin
make install

# set the environment variables and run the service
MF_OPCUA_ADAPTER_HTTP_PORT=[Service HTTP port] \
MF_OPCUA_ADAPTER_LOG_LEVEL=[OPC-UA Adapter Log Level] \
MF_NATS_URL=[NATS instance URL] \
MF_OPCUA_ADAPTER_INTERVAL_MS: [OPC-UA Server Interval (milliseconds)] \
MF_OPCUA_ADAPTER_POLICY=[OPC-UA Server Policy] \
MF_OPCUA_ADAPTER_MODE=[OPC-UA Server Mode] \
MF_OPCUA_ADAPTER_CERT_FILE=[OPC-UA Server Certificate file] \
MF_OPCUA_ADAPTER_KEY_FILE=[OPC-UA Server Key file] \
MF_OPCUA_ADAPTER_ROUTE_MAP_URL=[Route-map database URL] \
MF_OPCUA_ADAPTER_ROUTE_MAP_PASS=[Route-map database password] \
MF_OPCUA_ADAPTER_ROUTE_MAP_DB=[Route-map instance name] \
MF_THINGS_ES_URL=[Things service event source URL] \
MF_THINGS_ES_PASS=[Things service event source password] \
MF_THINGS_ES_DB=[Things service event source password] \
MF_OPCUA_ADAPTER_EVENT_CONSUMER=[OPC-UA adapter instance name] \
$GOBIN/mainflux-opcua
```

### Using docker-compose

This service can be deployed using docker containers.
Docker compose file is available in `<project_root>/docker/addons/opcua-adapter/docker-compose.yml`. In order to run Mainflux opcua-adapter, execute the following command:

```bash
docker-compose -f docker/addons/opcua-adapter/docker-compose.yml up -d
```

## Usage

For more information about service capabilities and its usage, please check out
the [Mainflux documentation](https://docs.mainflux.io/opcua).