With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
stpMaxAge
stp Max Age
1.3.6.1.4.1.11.2.14.3.6.11
The maximum age allowed of Config information for a port before a bridge will attempt to become the root (in seconds). Transmitted by this bridge when it is, or is attempting to become the root. see: IEEE 802.1(d) 6.8.1.1.3(11), 6.8.1.2.2(1), 4.5.3.8
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IPHost Network monitor allows you to monitor stpMaxAge on Hewlett Packard device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.