massive data logging

[gdimaria]

This example will push only objects that have influx tag attached.

Code:

local http = require('socket.http')
http.TIMEOUT = 5

local objs = {}
local tagobjs = grp.tag('influx')

for _, obj in ipairs(tagobjs) do
  objs[ obj.address ] = {
    name = obj.name:gsub(' ', '\\ '),
    datatype = obj.datatype,
  }
end

function callback(event)
  local addr = event.dst
  local obj = objs[ addr ]

  if obj then
    local value = knxdatatype.decode(event.datahex, obj.datatype)
    sendmetric('rawdata', obj.name, addr, value)
  end
end

function sendmetric(table, name, addr, value)
  local url = 'https://europe-west1-1.gcp.cloud2.influxdata.com/api/v2/write?bucket=XX&org=XXX'
  local body

  if type(value) == 'boolean' or type(value) == 'number' then
    body = string.format('%s,name=%s,addr=%s state=%s', table, name, addr, value)
  elseif type(value) == 'string' then
    body = string.format('%s,name=%s,addr=%s value=%q', table, name, addr, value)
  else
    log('invalid data type', addr, type(value))
    return
  end

  local res, code = http.request({
    url = url,
    method = 'POST',
    body = body,
    headers = {
      Authorization = 'Token XXXXXXXXXXXXXXXXXXX'
    }
  })

  if code ~= 204 then
    log('error sending to influx', res, code, body)
  end
end

local busclient = require('localbus').new()
busclient:sethandler('groupwrite', callback)

while true do
  busclient:loop(1)
end

Everything is fine (although I still have to learn how to handle the data to create a decent report  )

Now  I have the final step: to connect influxdb to Grafana.

I don't know how to choose the right authentication metod to connect it. Where to put the token and org name??!