I am working on the eNode B part for NB-IOT of OpenAirInterface, would anyone have any experience with having the GPy attach to a private network using OpenAirInterface?

lte = LTE(carrier="standard")
lte.attach(band=7)
#lte.attach(apn="oai")

while not lte.isattached():
    time.sleep(0.5)
    print('Attaching...')

print('Attach Successful')

lte.connect()
while not lte.isconnected():
    time.sleep(0.5)
    print('Connecting...')

Attaching seems to have no success at all.

Appreciate any help. Thanks!