Direct method always return {"status:500", "payload":null} result on invocation on Raspberry pi 3

I am referring to the https://github.com/Azure/azure-iot-sdk-node/blob/master/device/samples/simple_sample_module_method.js

link. This is my app.js:

'use strict';
var Transport = require('azure-iot-device-mqtt').Mqtt;
var Client = require('azure-iot-device').ModuleClient;
var Message = require('azure-iot-device').Message;

Client.fromEnvironment(Transport, function (err, client) 
{
  if (err) 
  {
    throw err;
  }
  else 
  {
    client.on('error', function (err) 
    {
      throw err;
    });

    // connect to the Edge instance
    client.open(function (err) 
    {
      if (err) 
      {
        throw err;
      } else 
      {
        console.log('IoT Hub module client initialized');
        // Act on input messages to the module.
        client.on('inputMessage', function (inputName, msg) 
        {
          pipeMessage(client, inputName, msg);
        });

        client.onMethod('getdevices', function(request,response)
        {
          console.log('getdevices called');
          if(request.payload)
          {
            console.log('Payload:');
            console.dir(request.payload);
          }
          var responseBody = 
          {
            message: 'list of all devices.'
          };

          response.send(200, responseBody, function(err)
          {
            if (err) 
            {
              console.log('failed sending method response: ' + err);
            }
            else
            {
              console.log('successfully sent method response');
            }
          });
        });
      }
    });
  }
});

// This function just pipes the messages without any change.
function pipeMessage(client, inputName, msg) {
  client.complete(msg, printResultFor('Receiving message'));

  if (inputName === 'input1') {
    var message = msg.getBytes().toString('utf8');
    if (message) {
      var outputMsg = new Message(message);
      client.sendOutputEvent('output1', outputMsg, printResultFor('Sending received message'));
    }
  }
}

// Helper function to print results in the console
function printResultFor(op) {
  return function printResult(err, res) {
    if (err) {
      console.log(op + ' error: ' + err.toString());
    }
    if (res) {
      console.log(op + ' status: ' + res.constructor.name);
    }
  };
}

The docker images for the same is: gaurav28/nodedb:0.0.1-arm32v7 running on Raspbian Stretch Raspberry pi 3 Model B+

Whenever I try to invoke my function, I get the same response

[toolboc]

@gauravagarwal28 it should not matter if the modules are referenced from Dockerhub or ACR as the exact same deployment produced a working response on AMD64 but failed only on ARM32. This also allows the attached sample code to be reproducible by others without ACR credentials. It appears that this issue is isolated to ARM32 platforms and that both JS and C# modules are producing the same error response on attempts to invoke Direct Methods.

@varunpuranik could you post the module code that you used which allowed you to invoke a DirectMethod on the Pi? I am getting the same response {"status":500,"payload":null} whether I use a JS or C# module. As soon as I deploy the exact same code to an AMD64 device I get a proper status:200 response. Both devices are hard-wired to the same router. This looks like an issue with the ARM32 runtime on my end.

[toolboc]

@gauravagarwal28 , I have noticed this exact same issue on ARM devices using very similar code. I am suspicious that direct methods do not work in the ARM SDKs.

My experience with this issue is documented @ https://github.com/Azure/iotedge/issues/98#issuecomment-415836594