networking - Azure IoT Hub MQTT no connection, select/SSL failures -


i'm using programs based on azure-iot-hub-c-sdk mqtt examples samples itself. on ubuntu machine, after starting program, repeating connection error:

./iotsdk_linux/serializer/samples/devicetwin_simplesample/devicetwin_simplesample info: iot hub sdk c, version 1.1.21 error: time:fri aug 18 19:39:22 2017 file:/home/user/workspacemisc/azure-iot-sdk-c/c-utility/adapters/socketio_berkeley.c func:socketio_open line:676 failure: select failure. info: closing tlsio state other tlsio_state_ext_open or tlsio_state_ext_error error: time:fri aug 18 19:39:22 2017 file:/home/user/workspacemisc/azure-iot-sdk-c/c-utility/src/tlsio_openssl.c func:on_underlying_io_open_complete line:688 invalid tlsio_state. expected state tlsio_state_opening_underlying_io. error: time:fri aug 18 19:39:22 2017 file:/home/user/workspacemisc/azure-iot-sdk-c/c-utility/src/tlsio_openssl.c func:tlsio_openssl_open line:1202 failed opening underlying i/o. error: time:fri aug 18 19:39:22 2017 file:/home/user/workspacemisc/azure-iot-sdk-c/umqtt/src/mqtt_client.c func:mqtt_client_connect line:974 error: io_open failed error: time:fri aug 18 19:39:22 2017 file:/home/user/workspacemisc/azure-iot-sdk-c/iothub_client/src/iothubtransport_mqtt_common.c func:sendmqttconnectmsg line:1519 failure connecting address xxxx.azure-devices.net. reported state send iothub press enter end sample

this happens both simplesample_mqtt , devicetwin_simplesample. errors don't stop , have no chance trying program. changed connection strings in samples. amqp example (simplesample_amqp) not show connection errors , works fine after starting several times. on yocto board, see few connection errors @ every start of custom mqtt application built on sdk samples.

does know possible cause? don't know whether it's caused sdk, iot hub or local setup (ubuntu, yocto?). error cellular connection , reappears after running fine time.

please, if think should post more information, request that. right don't know start.

update: right now, nothing working anymore, errors, applications don't connect anymore. see issue on github here: https://github.com/azure/azure-iot-sdk-c/issues/214


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