function snmpGet()

Execute SNMP GET call to given host and oid to read the response. The call is asynchronous: the code execution proceeds immediately and when the response arrives, callback function is called.

nil snmpGet(table config)

Parameters

table config{host, oid, callback, snmpVersion,community, timeout}

• string host host IP adress, may contain transport protocol and port (for example tcp:myhost.com:162)
• string oid object identifier
• function{response} callback this function is called when response arrives
• string snmpVersion version of SNMP (SNMP_VERSION.Snmp1 or SNMP_VERSION.Snmp2c)
• string community SNMP community string
• optional number timeout maximum seconds to wait for response (default 30)

Callback Parameters

table response{result, errorInfo, oid, value}

• number result error code of the response (0 is success)
• string errorInfo error description (if result>0)
• string oid oid we got
• string value value for the oid

Return value

nil

Usage

-- switch all outputs on NETIO with IP in 'host' parameter
local function snmpcallback(data)
  if data.result == 0 then
    output=tonumber(string.sub(data.oid, -1))
    outputStatus=tonumber(data.value)
    devices.system.SetOut{output=output, value=(outputStatus == 0)}
  else
       log(string.format("snmpget failed with error %d: %s", data.result, data.errorInfo))
  end
end

for i = 1,4 do
  snmpGet{host='10.0.0.102', timeout=6, oid=string.format(".1.3.6.1.4.1.47952.1.1.1.3.%d", i), snmpVersion=SNMP_VERSION.Snmp1, community='public', callback=snmpcallback}
end

Requirements

Netio FirmWare 3.3.0+