receive SMS using python and python-smpp - python-3.x

Question

I'm a newbie in SMPP but I need to simulate traffic over the SMPP protocol. I have found the tutorial how to send SMS using smpp lib from Python How to Send SMS using SMPP Protocol
I'm trying to write a receiver,but I am unable to get it to work. Please help.
My code is:
import smpplib
class ClientCl():
client=None
def receive_SMS(self):
client=smpplib.client.Client('localhost',1000)
try:
client.connect()
client.bind_receiver("sysID","login","password")
sms=client.get_message()
print(sms)
except :
print("boom! nothing works")
pass
sms_getter=ClientCl.receive_SMS

Answer 1

From what I can understand the smpplib you are using is the one available at github. Looking at your code and the client code, I can't find the function client.get_message. Perhaps you have an older version of the library? Or I have the wrong library. In any case, it is likely that the get_message function does not block and wait for the message to arrive.
Looking at the client code it seems that you have two options:
Poll the library until you get a valid message
Setup the library to listen to the SMPP port and call a function once a message arrives.
If you look at the README.md file it shows how you can setup the library to implement the second option (which is the better option).
...
client = smpplib.client.Client('example.com', SOMEPORTNUMBER)
# Print when obtain message_id
client.set_message_sent_handler(
lambda pdu: sys.stdout.write('sent {} {}\n'.format(pdu.sequence, pdu.message_id)))
client.set_message_received_handler(
lambda pdu: sys.stdout.write('delivered {}\n'.format(pdu.receipted_message_id)))
client.connect()
client.bind_transceiver(system_id='login', password='secret')
for part in parts:
pdu = client.send_message(
source_addr_ton=smpplib.consts.SMPP_TON_INTL,
#source_addr_npi=smpplib.consts.SMPP_NPI_ISDN,
# Make sure it is a byte string, not unicode:
source_addr='SENDERPHONENUM',
dest_addr_ton=smpplib.consts.SMPP_TON_INTL,
#dest_addr_npi=smpplib.consts.SMPP_NPI_ISDN,
# Make sure thease two params are byte strings, not unicode:
destination_addr='PHONENUMBER',
short_message=part,
data_coding=encoding_flag,
esm_class=msg_type_flag,
registered_delivery=True,
)
print(pdu.sequence)
client.listen()
...
When receiving a message or delivery receipt the function defined in client.set_message_received_handler() will be called. In the example, it is a lambda function. There is also an example on how to set up for listening in a thread.
If you prefer the simpler polling option you should use the poll function. For the simplest implementation all you need to do is:
while True:
client.Poll()
As before, the function set in client.set_message_received_handler() will be called once a message arrives.