Use API by python to get gateway data

1

Hello ,everyone! I am new in the area of lorawan and chirpstack. I am trying to use API to get gateway data ,but when I use python, I always find an error during the gRPC communication. The following is my code in python.
import requests
import os
import sys
import grpc
import chirpstack_api
from chirpstack_api import api

server = “”

my server host & port

api_token = “”

my api token

channel = grpc.insecure_channel(server)

auth_token = [(“authorization”, “Bearer %s” % api_token)]
def get_data():
client = api.GatewayServiceStub(channel)
req = api.GetGatewayMetricsRequest()
resp = client.GetMetrics(req, metadata=auth_token)
resp.gateway_id = “02819ffffed4f1fd”
resp.start = 1700736381
resp.end = 1701660147
# resp.aggregation = 1
print(resp)

if name == “main”:
get_data()
The following is the error.
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
status = StatusCode.INTERNAL
details = “Invalid string length”
debug_error_string = “UNKNOWN:Error received from peer {grpc_message:“Invalid string length”, grpc_status:13, created_time:“2023-12-12T03:18:37.688138+00:00”}”

If you have advice in my question, I will be very grateful to you ! Thank you very much!

1 Like
2

Hi,
Try with:
resp.start.seconds = 1700736381
resp.end.seconds = 1701660147

Not tested with the Python lib, but works with direct API call.

3

Thank you very much! But what is “direct API call”? How does it run?

4

You can make direct API calls from Postman for instance.

5

OK, thank you! I will try it again!

6

Hey mizi,

In the documentation it shows that the start and end need to be of variable type google.protobuf.Timestamp.

message GetGatewayMetricsRequest {
    // Gateway ID (EUI64).
    string gateway_id = 1;

    // Interval start timestamp.
    google.protobuf.Timestamp start = 2;

    // Interval end timestamp.
    google.protobuf.Timestamp end = 3;

    // Aggregation.
    common.Aggregation aggregation = 4;
}

This seemed to work on my end:

import grpc
from chirpstack_api import api
# Need to import this to create timestamp object
from google.protobuf.timestamp_pb2 import Timestamp

# API interface.
server = "localhost:8080"

# Use this API token: Network API Key
api_token = "token"

# Connect without using TLS.
channel = grpc.insecure_channel(server)

# API client configuration.
gtw_client = api.GatewayServiceStub(channel)

# Define the API key meta-data.
auth_token = [("authorization", "Bearer %s" % api_token)]

try:
    # Create timestamps
    start = Timestamp()
    start.FromSeconds(1700736381)
    end = Timestamp()
    end.FromSeconds(1701660147)

    req = api.GetGatewayMetricsRequest(gateway_id="id", start=start, end=end) 
    resp = gtw_client.GetMetrics(req, metadata=auth_token)
except Exception as e:
    print("Exception occurred: " + str(e))
print(resp)