Garbaged SNMP values (apps)ΒΆ

  1. When my PySNMP application prints out fetched values, some of them come out as a garbage on my screan. Here’s my code:
 for varBind in varBinds:
   print(' = '.join([ str(x) for x in varBind ])

and the result is:
 1.3.6.1.4.1.161.19.3.2.1.63.0 = 50000
 1.3.6.1.4.1.161.19.3.2.1.4.0 = '\x01\x02\x03\x04'

The IpAddress type seems to be the only one with this problem.
  1. Always use prettyPrint() method for all pyasn1-based objects – it automatically converts ASN1 types to human-friendly form.
> > > from pysnmp.proto import rfc1902
> > > a = rfc1902.IpAddress('1.2.3.4')
> > > str(a)
'\x01\x02\x03\x04'
> > > a
IpAddress('1.2.3.4')
> > > a.prettyPrint()
'1.2.3.4'
> > > rfc1902.IpAddress.prettyPrint(a)
'1.2.3.4'

See pyasn1 tutorial for more information on pyasn1 data model.