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#
# example of using a connection callback that will be called
# for any change in connection status
import epics
import time
import pvnames
import sys
write = sys.stdout.write
def onConnectionChange(pvname=None, **kws):
write('ca connection status changed: %s %s\n' % ( pvname, repr(kws)))
chid = epics.ca.create_channel(pvnames.long_pv, callback=onConnectionChange)
write('Now, restart simulation IOC -- waiting, watching values and connection changes:\n')
t0 = time.time()
while time.time()-t0 < 15:
time.sleep(0.001)
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