Add swapped word order encodings (#100)

README.md

@@ -326,12 +326,14 @@ type: ...
 uri/device/id: ...
 register:
   address: 40070
-  length: 2
-  type: holding
-  decode: int32
+  length: 2 # read length in words
+  type: holding # holding or input
+  decode: int32 # int16|32|64, uint16|32|64, float32|64 and u|int32s
 scale: -1 # floating point factor applied to result, e.g. for kW to W conversion
 ```
 
+The `int32s/uint32s` decodings apply swapped word order and are useful e.g. with E3/DC devices.
+
 ### MQTT (read/write)
 
 The `mqtt` plugin allows to read values from MQTT topics. This is particularly useful for meters, e.g. when meter data is already available on MQTT. See [MBMD](5) for an example how to get Modbus meter data into MQTT.

go.mod

@@ -29,11 +29,11 @@ require (
 	github.com/spf13/viper v1.6.3
 	github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
 	github.com/technoweenie/multipartstreamer v1.0.1 // indirect
-	github.com/volkszaehler/mbmd v0.0.0-20200503193948-a6d683635a15
+	github.com/volkszaehler/mbmd v0.0.0-20200505114042-9732bf1ad846
 	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79 // indirect
-	golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5 // indirect
+	golang.org/x/net v0.0.0-20200505041828-1ed23360d12c // indirect
 	golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3 // indirect
-	golang.org/x/tools v0.0.0-20200504022951-6b6965ac5dd1
+	golang.org/x/tools v0.0.0-20200505023115-26f46d2f7ef8
 )
 
 replace github.com/spf13/viper => github.com/andig/viper v1.6.3-0.20200308172723-deb8393798ec

go.sum

@@ -26,6 +26,7 @@ github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuy
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alvaroloes/enumer v1.1.2 h1:5khqHB33TZy1GWCO/lZwcroBFh7u+0j40T83VUbfAMY=
 github.com/alvaroloes/enumer v1.1.2/go.mod h1:FxrjvuXoDAx9isTJrv4c+T410zFi0DtXIT0m65DJ+Wo=
 github.com/andig/gosunspec v0.0.0-20200429133549-3cf6a82fed9c h1:AMtX56iHlNYVxMID7fe9efuVtaxgtdjyMeolg7q87IE=
 github.com/andig/gosunspec v0.0.0-20200429133549-3cf6a82fed9c/go.mod h1:YkshK8WMzYn1iXAZzHUO75gIqhMSan2ctgBVtBkRIyA=
@@ -51,6 +52,7 @@ github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -215,6 +217,7 @@ github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3Rllmb
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
+github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1 h1:/I3lTljEEDNYLho3/FUB7iD/oc2cEFgVmbHzV+O0PtU=
 github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1/go.mod h1:eD5JxqMiuNYyFNmyY9rkJ/slN8y59oEu4Ei7F8OoKWQ=
 github.com/pbnjay/strptime v0.0.0-20140226051138-5c05b0d668c9 h1:4lfz0keanz7/gAlvJ7lAe9zmE08HXxifBZJC0AdeGKo=
 github.com/pbnjay/strptime v0.0.0-20140226051138-5c05b0d668c9/go.mod h1:6Hr+C/olSdkdL3z68MlyXWzwhvwmwN7KuUFXGb3PoOk=
@@ -240,9 +243,11 @@ github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7z
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
@@ -283,8 +288,8 @@ github.com/tebeka/strftime v0.1.3/go.mod h1:7wJm3dZlpr4l/oVK0t1HYIc4rMzQ2XJlOMIU
 github.com/technoweenie/multipartstreamer v1.0.1 h1:XRztA5MXiR1TIRHxH2uNxXxaIkKQDeX7m2XsSOlQEnM=
 github.com/technoweenie/multipartstreamer v1.0.1/go.mod h1:jNVxdtShOxzAsukZwTSw6MDx5eUJoiEBsSvzDU9uzog=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
-github.com/volkszaehler/mbmd v0.0.0-20200503193948-a6d683635a15 h1:ZFz4e6qjfLh5HflRfI+yA9rXR6p7f5FsRF8I8WtEedI=
-github.com/volkszaehler/mbmd v0.0.0-20200503193948-a6d683635a15/go.mod h1:MmglPXoZJOT0r+tWwAjaaRWmuopdQOq2tWxbL9zvuxE=
+github.com/volkszaehler/mbmd v0.0.0-20200505114042-9732bf1ad846 h1:PwtXvfj0GBgSOFHSxoV+YB/Ii0TV12W17YE844R9w/o=
+github.com/volkszaehler/mbmd v0.0.0-20200505114042-9732bf1ad846/go.mod h1:MmglPXoZJOT0r+tWwAjaaRWmuopdQOq2tWxbL9zvuxE=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
@@ -337,8 +342,8 @@ golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5 h1:WQ8q63x+f/zpC8Ac1s9wLElVoHhm32p6tudrU72n1QA=
-golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/net v0.0.0-20200505041828-1ed23360d12c h1:zJ0mtu4jCalhKg6Oaukv6iIkb+cOvDrajDH9DH46Q4M=
+golang.org/x/net v0.0.0-20200505041828-1ed23360d12c/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -399,8 +404,8 @@ golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200420001825-978e26b7c37c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.0.0-20200504022951-6b6965ac5dd1 h1:C8rdnd6KieI73Z2Av0sS0t4kW+geIH/M8kNX8Hmvn9E=
-golang.org/x/tools v0.0.0-20200504022951-6b6965ac5dd1/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20200505023115-26f46d2f7ef8 h1:BMFHd4OFnFtWX46Xj4DN6vvT1btiBxyq+s0orYBqcQY=
+golang.org/x/tools v0.0.0-20200505023115-26f46d2f7ef8/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=

provider/modbus/modbus.go

@@ -36,16 +36,22 @@ func RegisterOperation(r Register) (rs485.Operation, error) {
 	switch strings.ToLower(r.Decode) {
 	case "float32", "ieee754":
 		op.Transform = rs485.RTUIeee754ToFloat64
+	case "float64":
+		op.Transform = rs485.RTUUint64ToFloat64
 	case "uint16":
 		op.Transform = rs485.RTUUint16ToFloat64
 	case "uint32":
 		op.Transform = rs485.RTUUint32ToFloat64
+	case "uint32s":
+		op.Transform = rs485.RTUUint32ToFloat64Swapped
 	case "uint64":
 		op.Transform = rs485.RTUUint64ToFloat64
 	case "int16":
 		op.Transform = rs485.RTUInt16ToFloat64
 	case "int32":
 		op.Transform = rs485.RTUInt32ToFloat64
+	case "int32s":
+		op.Transform = rs485.RTUInt32ToFloat64Swapped
 	default:
 		return rs485.Operation{}, fmt.Errorf("invalid register decoding: %s", r.Decode)
 	}