I am unable to update lastvalue using item.update. Please advise how I can update item lastvalue since I am using API. There will be no zabbix agent to collect values for these items. I will be using type as Trapper and trying to udpate via API.
Here is the documentation of Item: http://www.zabbix.com/documentation/1.8/api/item

Here is what I am sending
itemNameIds: 22942
2012-03-03 21:58:16,892 [main] TRACE com.sabre.zabbix.util.ZabbixApiUtil - Writing json command {
"jsonrpc" : "2.0",
"method" : "item.update",
"params" :

{ "key_" : "ERR_SVC_UNAVAIL", "itemid" : "22942", "lastvalue" : "0", "type" : 2, "value_type" : 0 }

,
"id" : "2",
"auth" : "69c1fe3c5ac4863f5677d4b974b93faa"
}
2012-03-03 21:58:16,892 [main] TRACE com.sabre.zabbix.util.ZabbixApiUtil - Received json response {
"jsonrpc" : "2.0",
"result" :

{ "itemids" : [ "22942" ] }

,
"id" : "2"
}