Configuring Edge Flow Manager properties

To integrate Edge Flow Manager with Kafka, you need to configure the Edge Flow Manager properties in the efm.properties file.

You have created Kafka topics to receive heartbeats and acknowledgements from MiNiFi agents.

Set the following property to true:
```
efm.heartbeat.kafka.publishEnabled=true
```
If you do not set it to true, none of the configurations are considered.
Set the following property to provide comma separated addresses for brokers if Kafka runs in a cluster:
```
efm.heartbeat.kafka.brokerAddress=localhost:9093
```
Set the ID that shows up as client on Kafka side logs.
```
efm.heartbeat.kafka.clientId=efm
```
Provide topic names where the heartbeat and acknowledgement messages are sent to respectively.
```
efm.heartbeat.kafka.heartbeatTopicName=heartbeat
efm.heartbeat.kafka.ackTopicName=ack
```
The topic names must match the topics previously created on Kafka side.

Optional. Set the following Kafka parameters:

efm.heartbeat.kafka.retryBackoff=1000
efm.heartbeat.kafka.reconnectBackoff=1000
efm.heartbeat.kafka.reconnectBackoffMax=60000
efm.heartbeat.kafka.requestTimeout=30000
efm.heartbeat.kafka.bufferMemory=33554432
efm.heartbeat.kafka.batchSize=16384
efm.heartbeat.kafka.compressionType=gzip
efm.heartbeat.kafka.deliveryTimeout=120000
efm.heartbeat.kafka.maxRequestSize=1048576
efm.heartbeat.kafka.acks=1

Fore more details on Kafka parameters, see https://kafka.apache.org/documentation/.

Optional. Set the following properties if two-way TLS is enabled:

efm.heartbeat.kafka.ssl.enabled=true
efm.heartbeat.kafka.ssl.keystoreLocation=
efm.heartbeat.kafka.ssl.keystorePassword=
efm.heartbeat.kafka.ssl.keyPassword=
efm.heartbeat.kafka.ssl.truststoreLocation=
efm.heartbeat.kafka.ssl.truststorePassword=
efm.heartbeat.kafka.ssl.securityProtocol=SSL
efm.heartbeat.kafka.ssl.enabledProtocols=

Optional. Set the following properties if SASL_SSL authentication is enabled:

efm.heartbeat.kafka.ssl.enabled=true
efm.heartbeat.kafka.ssl.truststoreLocation=
efm.heartbeat.kafka.ssl.truststorePassword=
efm.heartbeat.kafka.ssl.securityProtocol=SASL_SSL
efm.heartbeat.kafka.ssl.saslSslUsername=client
efm.heartbeat.kafka.ssl.saslSslPassword=client-secret