Executing Modbus Module Example Throws OpenSSL Error

[WilliamBerryiii]

OS: Linux raspberrypi 4.4.26-v7+ GCC: (Raspbian 4.9.2-10) 4.9.2

When the current version of the module is built and run against the 2016-11-18 branch of the azure-iot-gateway-sdk the following error is thrown indicating a failure to establish a connection to the IoT Hub:

Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/c-utility/src/tlsio_openssl.c Func:log_ERR_get_error Line:296 Failed allocating OpenSSL context.
Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/c-utility/src/tlsio_openssl.c Func:log_ERR_get_error Line:303   [0] error:140A90A1:lib(20):func(169):reason(161)
Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/iot-sdk/c/iothub_client/src/iothubtransport_amqp_common.c Func:establishConnection Line:627 Failed to open the connection with CBS.
Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/iot-sdk/c/iothub_client/src/iothubtransport_amqp_common.c Func:IoTHubTransport_AMQP_Common_DoWork Line:1349 AMQP transport failed to establish connection with service.
Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/iot-sdk/c/iothub_client/src/iothubtransportamqp_auth.c Func:authentication_reset Line:637 Failed to reset the authentication state (authentication status is invalid: 0)
Error: Time:Wed Dec 21 12:58:55 2016 File:/home/pi/code/azure-iot-gateway-sdk/deps/iot-sdk/c/iothub_client/src/iothubtransport_amqp_common.c Func:prepareDeviceForConnectionRetry Line:1071 Failed resetting the authenticatication state of device �   �r

The IoTHub module's transport was set to AMQP as follows:

{
      "name": "IotHub",
      "loader": {
        "name": "native",
        "entrypoint": {
          "module.path": "../../modules/iothub/libiothub.so"
        }
      },
      "args": {
        "IoTHubName": "********",
        "IoTHubSuffix": "*********",
        "Transport": "AMQP"
      }
    },

And the modbus_read module is configured for TCP:

      "name": "modbus_read",
      "loader": {
        "name": "native",
        "entrypoint": {
          "module.path": "../../modules/modbus_read/libmodbus_read.so"
        }
      },
      "args": [
        {
          "serverConnectionString": "10.121.208.5",
          "interval": "2000",
          "macAddress": "01:01:01:01:01:01",
          "deviceType": "powerMeter",
          "operations": [
            {
              "unitId": "0",
              "functionCode": "4",
              "startingAddress": "1",
              "length": "10"
            }
          ]
        }
      ]

The error is not thrown with a similar IoT Hub and Device configuration in the simulated_device_cloud_upload sample project in the base SDK repository.

The error seems to pivot around registering a macAddress with the mapping module that is the same as what is in the modbus_read module.

[stephenctw]

Hi, Thanks for reporting this. Try to use simulated_device_cloud_upload sample program as your main program and load it with modbus_lin.json. This is just a work around and I will update the fix later.

[stephenctw]

Now done.