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For every new LND version the LND RPC libs need to be compiled from the matching protobuff files. Do this on a raspberrypi with the exact same python version the scripts will be are running on. See https://dev.lightning.community/guides/python-grpc/
To generate the lnd RPC libs - login as admin and run:
cd
python3 -m pip install grpcio grpcio-tools googleapis-common-protos pathlib2
git clone https://github.com/googleapis/googleapis.git
curl -o rpc.proto -s https://raw.githubusercontent.com/lightningnetwork/lnd/master/lnrpc/rpc.proto
python -m grpc_tools.protoc --proto_path=googleapis:. --python_out=. --grpc_python_out=. rpc.proto
NOTE: If LND master branch is already a version ahead .. use the rpc.proto from the version tagged branch.
Make sure the first 3 lines of the rpc_pb2_grpc.py look like the following for python3 compatibility:
from __future__ import absolute_import
import grpc
from . import rpc_pb2 as rpc__pb2
Now copy the generated RPC libs per SCP over to your Laptop and add them to the /home/admin/config.scripts/lndlibs.
scp admin@192.168.X.X:/home/admin/rpc_pb2_grpc.py ./ scp admin@192.168.X.X:/home/admin/rpc.proto ./ scp admin@192.168.X.X:/home/admin/rpc_pb2.py ./