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import epics
import time
def onConnectionChange(pvname=None, conn= None, **kws):
print(f'PV connection status changed: {pvname} {conn}')
def onValueChange(pvname=None, value=None, host=None, **kws):
print(f'PV value changed: {pvname} ({host}) {value}')
mypv = epics.get_pv('PyTest:ao1.VAL',
connection_callback= onConnectionChange,
callback= onValueChange)
mypv.get()
print('Now wait for changes')
expire_time = time.time() + 60.
while time.time() < expire_time:
time.sleep(0.01)
print('Done.')
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