Bump iothub dependency.

Author: brocaar

go.mod

@@ -4,7 +4,7 @@ require (
 	cloud.google.com/go v0.34.0
 	github.com/Azure/azure-service-bus-go v0.4.1
 	github.com/NickBall/go-aes-key-wrap v0.0.0-20170929221519-1c3aa3e4dfc5
-	github.com/amenzhinsky/iothub v0.0.0-20190415141912-fb38f4d4c9fb
+	github.com/amenzhinsky/iothub v0.1.0
 	github.com/brocaar/lorawan v0.0.0-20190308082318-5ed881e0a2d7
 	github.com/eclipse/paho.mqtt.golang v1.1.1
 	github.com/elazarl/go-bindata-assetfs v1.0.0

go.sum

@@ -29,6 +29,8 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf h1:qet1QNfXsQxTZq
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/amenzhinsky/iothub v0.0.0-20190415141912-fb38f4d4c9fb h1:ni2HPOcImx1iqm16mxjZRRzsXcwvzzsi2fZg0lRLvr0=
 github.com/amenzhinsky/iothub v0.0.0-20190415141912-fb38f4d4c9fb/go.mod h1:5SMEOj96ci5bC7bp/RB1jH44yY5SzQnspyOov8hk39w=
+github.com/amenzhinsky/iothub v0.1.0 h1:nwOWAgRW8WJV8d91NNLUf2Q9sN3OsNyMsE+jactOJhs=
+github.com/amenzhinsky/iothub v0.1.0/go.mod h1:5SMEOj96ci5bC7bp/RB1jH44yY5SzQnspyOov8hk39w=
 github.com/apex/log v1.1.0 h1:J5rld6WVFi6NxA6m8GJ1LJqu3+GiTFIt3mYv27gdQWI=
 github.com/apex/log v1.1.0/go.mod h1:yA770aXIDQrhVOIGurT/pVdfCpSq1GQV/auzMN5fzvY=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=

internal/backend/gateway/azureiothub/azureiothub.go

@@ -82,9 +82,6 @@ func NewBackend(c config.Config) (gateway.Gateway, error) {
 		return nil, errors.Wrap(err, "new queue client error")
 	}
 
-	// TODO: migrate to IoT Hub REST API?
-	// Unfortunately, there is no documentation available on how to use the API:
-	// https://docs.microsoft.com/en-us/rest/api/iothub/service/senddevicecommand
 	b.iotClient, err = iotservice.New(
 		iotservice.WithConnectionString(conf.CommandsConnectionString),
 	)