checkOnline in controller ZMemError about zigbee-shepherd HOT 2 OPEN

I slowed the querying down and now most of the time it returns with a status code of 0, still ZNP online devices time out. & I can see with a packet sniffer that no node description request is actually being sent by the coordinator dongle.

Route Request packets do go out for those devices which are not on the network however. Those on the network are sent no packets.

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Ok,

so there is two bugs in this function:

1. Performing all of these (and anything else going on in the background, which is quite alot during initialization) at once results in memory exhaustion on the dongle.

2. The timeout of 5s is insufficient for devices that sleep. In fact the devices I tested never return when queried here. If the device is not allowed to sleep during init, i.e for an IAS sensor if it is being toggled throught init then it does respond.
   '
   I propose replacement of this method with an LQI based query to the routers in the network. This way the sleeping end devices are not involved.

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