Logstash SNMP input plugin: no data extracted


I am using the SNMP input plugin with the following configurations:

input {
  snmp {
    walk => [""]
    hosts => [{host => "udp:XXXXXXXX/161" community => "public" version => "2c"  retries => 2  timeout => 1000}]
  stdout { codec => "rubydebug"}

I haven't errors in the logstash log but no data is extracted, while putting a wrong ip I see errors in the log.
Can you help me to understand why no data are extracted?

Logstash version: 7.6.2



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