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README.md
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README.md
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# snmp-mqtt
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This project is directly derived from https://github.com/dchote/snmp-mqtt
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A simple go app that reads SNMP values and publishes it to the specified MQTT endpoint at the specified interval.
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In constrast to the original version, all configuration must be provided via an environment variable containing
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a JSON string.
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The MQTT configuration is part of this JSON string.
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The topic has been moved to the MQTT configuration and there is now only one topic for all endpoints and variables.
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The published message on MQTT looks like this:
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```
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{"device":"172.16.3.1","label":"router","variables":{"lan-in":{"label":"lan-in","variable":".1.3.6.1.2.1.31.1.1.1.6.2","value":"979673705579"},"lan-out":{"label":"lan-out","variable":".1.3.6.1.2.1.31.1.1.1.10.2","value":"1813410276168"},"wan-in":{"label":"wan-in","variable":".1.3.6.1.2.1.31.1.1.1.6.4","value":"83591215399"},"wan-out":{"label":"wan-out","variable":".1.3.6.1.2.1.31.1.1.1.10.4","value":"83741895468"}}}
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```
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```
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export SNMP_MQTT_CONF=$(cat config.json)
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./smq
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```
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An example config.json file:
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```
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{
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"mqtt": {
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"broker": "mqtt://172.23.1.102:1883",
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"tlsEnable": "false",
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"topic": "snmp"
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},
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"interval": 10,
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"snmpEndpoints": [
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{
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"endpoint": "172.16.3.1",
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"label": "router",
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"community": "public",
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"oidTopics": [
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{
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"oid": ".1.3.6.1.2.1.31.1.1.1.6.4",
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"label": "wan-in",
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"diff": "true"
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},
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{
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"oid": ".1.3.6.1.2.1.31.1.1.1.10.4",
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"label": "wan-out",
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"diff": "true"
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},
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{
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"oid": ".1.3.6.1.2.1.31.1.1.1.6.2",
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"label": "lan-in",
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"diff": "true"
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},
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{
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"oid": ".1.3.6.1.2.1.31.1.1.1.10.2",
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"label": "lan-out",
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"diff": "true"
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}
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]
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}
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]
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}
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```
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