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[modbus] Support chaining transformations without an intersection sym…
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…bol (openhab#17306)

* [modbus] Refactor to use ChannelTransformation

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>
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@jimtng @matchews
jimtng authored and matchews committed Oct 18, 2024
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22 changes: 15 additions & 7 deletions bundles/org.openhab.binding.modbus/README.md
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Expand Up @@ -201,11 +201,11 @@ You must give each of your data Things a reference (thing ID) that is unique for
| ------------------------------------------- | ------- | -------- | ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `readValueType` | text | | (empty) | How data is read from modbus. Use empty for write-only things.<br /><br />Bit value type must be used with coils and discrete inputs. With registers all value types are applicable. Valid values are: `"int64"`, `"int64_swap"`, `"uint64"`, `"uint64_swap"`, `"float32"`, `"float32_swap"`, `"int32"`, `"int32_swap"`, `"uint32"`, `"uint32_swap"`, `"int16"`, `"uint16"`, `"int8"`, `"uint8"`, or `"bit"`. See also [Value types on read and write](#value-types-on-read-and-write). |
| `readStart` | text | | (empty) | Start address to start reading the value. Use empty for write-only things. <br /><br />Input as zero-based index number, e.g. in place of `400001` (first holding register), use the address `"0"`. Must be between (poller start) and (poller start + poller length - 1) (inclusive).<br /><br />With registers and value type less than 16 bits, you must use `"X.Y"` format where `Y` specifies the sub-element to read from the 16 bit register:<ul> <li>For example, `"3.1"` would mean pick second bit from register index `3` with bit value type. </li><li>With int8 valuetype, it would pick the high byte of register index `3`.</li></ul> |
| `readTransform` | text | | `"default"` | Transformation to apply to polled data, after it has been converted to number using `readValueType`. <br /><br />Use "default" to communicate that no transformation is done and value should be passed as is.<br />Use `"SERVICENAME:ARG"` or `"SERVICENAME(ARG)"` (old syntax) to use transformation service `SERVICENAME` with argument `ARG`. <br />Any other value than the above types will be interpreted as static text, in which case the actual content of the polled value is ignored. You can chain many transformations with ∩, for example `"SERVICE1:ARG1∩SERVICE2:ARG2"`. |
| `readTransform` | text | | `"default"` | Transformation to apply to polled data, after it has been converted to number using `readValueType`. <br /><br />Use "default" to communicate that no transformation is done and value should be passed as is.<br />Use `"SERVICENAME(ARG)"` or `"SERVICENAME:ARG"` to use transformation service `SERVICENAME` with argument `ARG`. <br />Any other value than the above types will be interpreted as static text, in which case the actual content of the polled value is ignored. You can chain many transformations with ∩, for example `"SERVICE1(ARG1)∩SERVICE2(ARG2)"`. |
| `writeValueType` | text | | (empty) | How data is written to modbus. Only applicable to registers. Valid values are: `"int64"`, `"int64_swap"`, `"float32"`, `"float32_swap"`, `"int32"`, `"int32_swap"`, `"int16"`. See also [Value types on read and write](#value-types-on-read-and-write). Value of `"bit"` can be used with registers as well when `writeStart` is of format `"X.Y"` (see below). See also [Value types on read and write](#value-types-on-read-and-write). |
| `writeStart` | text | | (empty) | Start address of the first holding register or coil in the write. Use empty for read-only things. <br />Use zero based address, e.g. in place of `400001` (first holding register), use the address `"0"`. This address is passed to data frame as is. One can use `"X.Y"` to write individual bit `Y` of an holding `X` (analogous to `readStart`). |
| `writeType` | text | | (empty) | Type of data to write. Use empty for read-only things. Valid values: `"coil"` or `"holding"`.<br /><br /> Coil uses function code (FC) FC05 or FC15. Holding register uses FC06 or FC16. See `writeMultipleEvenWithSingleRegisterOrCoil` parameter. |
| `writeTransform` | text | | `"default"` | Transformation to apply to received commands.<br /><br />Use `"default"` to communicate that no transformation is done and value should be passed as is. <br />Use `"SERVICENAME:ARG"` or `"SERVICENAME(ARG)"` (old syntax) to use transformation service `SERVICENAME` with argument `ARG`. <br />Any other value than the above types will be interpreted as static text, in which case the actual content of the command value is ignored. You can chain many transformations with ∩, for example `"SERVICE1:ARG1∩SERVICE2:ARG2"`. |
| `writeTransform` | text | | `"default"` | Transformation to apply to received commands.<br /><br />Use `"default"` to communicate that no transformation is done and value should be passed as is. <br />Use `"SERVICENAME(ARG)"` or `"SERVICENAME:ARG"` to use transformation service `SERVICENAME` with argument `ARG`. <br />Any other value than the above types will be interpreted as static text, in which case the actual content of the command value is ignored. You can chain many transformations with ∩, for example `"SERVICE1(ARG1)∩SERVICE2(ARG2)"`. |
| `writeMultipleEvenWithSingleRegisterOrCoil` | boolean | | `false` | Controls how single register / coil of data is written.<br /> By default, or when 'false, FC06 ("Write single holding register") / FC05 ("Write single coil"). Or when 'true', using FC16 ("Write Multiple Holding Registers") / FC15 ("Write Multiple Coils"). |
| `writeMaxTries` | integer | | `3` | Maximum tries when writing <br /><br />Number of tries when writing data, if some of the writes fail. For single try, enter `1`. |
| `updateUnchangedValuesEveryMillis` | integer | | `1000` | Interval to update unchanged values. <br /><br />Modbus binding by default is not updating the item and channel state every time new data is polled from a slave, for performance reasons. Instead, the state is updated whenever it differs from previously updated state, or when enough time has passed since the last update. The time interval can be adjusted using this parameter. Use value of `0` if you like to update state with every poll, even though the value has not changed. In milliseconds. |
Expand Down Expand Up @@ -555,8 +555,16 @@ Note that transformation is only one part of the overall process how polled data
Consult [Read steps](#read-steps) and [Write steps](#write-steps) for more details.
Specifically, note that you might not need transformations at all in some uses cases.

Transformations can be chained in the UI by listing each transformation on a separate line, or by separating them with the mathematical intersection character "∩".
In the .things file, multiple transformations can be specified by enclosing each transformation with double quotes, and separating them with commas, for example,
this will chain `JSONPATH` and `MAP` transformations:

```java
Thing data DimmerReg [ ..., readTransform="JSONPATH($data)", "MAP(modbus_dimmer_read.map)", writeStart="4700", ... ]
```

Please also note that you should install relevant transformations in openHAB as necessary.
For example, `openhab-transformation-javascript` feature provides the javascript (`JS`) transformation.
For example, [openhab-automation-jsscripting](/addons/automation/jsscripting/) feature provides the javascript (`JS`) transformation.

#### Transform On Read

Expand All @@ -565,7 +573,7 @@ For example, `openhab-transformation-javascript` feature provides the javascript
There are three different format to specify the configuration:

1. String `"default"`, in which case the default transformation is used. The default is to convert non-zero numbers to `ON`/`OPEN`, and zero numbers to `OFF`/`CLOSED`, respectively. If the item linked to the data channel does not accept these states, the number is converted to best-effort-basis to the states accepted by the item. For example, the extracted number is passed as-is for `Number` items, while `ON`/`OFF` would be used with `DimmerItem`.
1. `"SERVICENAME:ARG"` for calling a transformation service. The transformation receives the extracted number as input. This is useful for applying complex arithmetic of the polled data before it is used in openHAB. See examples for more details.
1. `"SERVICENAME(ARG)"` for calling a transformation service. The transformation receives the extracted number as input. This is useful for applying complex arithmetic of the polled data before it is used in openHAB. See examples for more details.
1. Any other value is interpreted as static text, in which case the actual content of the polled value is ignored. Transformation result is always the same. The transformation output is converted to best-effort-basis to the states accepted by the item.

Consult [background documentation on items](https://www.openhab.org/docs/concepts/items.html) to understand accepted data types (state) by each item.
Expand All @@ -577,7 +585,7 @@ Consult [background documentation on items](https://www.openhab.org/docs/concept
There are three different format to specify the configuration:

1. String `"default"`, in which case the default transformation is used. The default is to do no conversion to the command.
1. `"SERVICENAME:ARG"` for calling a transformation service. The transformation receives the command as input. This is useful for applying complex arithmetic for commands before the data is written to Modbus. See examples for more details.
1. `"SERVICENAME(ARG)"` for calling a transformation service. The transformation receives the command as input. This is useful for applying complex arithmetic for commands before the data is written to Modbus. See examples for more details.
1. Any other value is interpreted as static text, in which case the actual command is ignored. Transformation result is always the same.

#### Example: Inverting Binary Data On Read And Write
Expand Down Expand Up @@ -841,7 +849,7 @@ Example for a dimmer device where 255 register value = 100% for fully ON:
```java
Bridge modbus:tcp:remoteTCP [ host="192.168.0.10", port=502 ] {
Bridge poller MBDimmer [ start=4700, length=2, refresh=1000, type="holding" ] {
Thing data DimmerReg [ readStart="4700", readValueType="uint16", readTransform="JS:dimread255.js", writeStart="4700", writeValueType="uint16", writeType="holding", writeTransform="JS:dimwrite255.js" ]
Thing data DimmerReg [ readStart="4700", readValueType="uint16", readTransform="JS(dimread255.js)", writeStart="4700", writeValueType="uint16", writeType="holding", writeTransform="JS(dimwrite255.js)" ]
}
}
```
Expand Down Expand Up @@ -922,7 +930,7 @@ Bridge modbus:tcp:localhostTCPRollerShutter [ host="127.0.0.1", port=502 ] {
Bridge poller holding [ start=0, length=3, refresh=1000, type="holding" ] {
// Since we are using advanced transformation outputting JSON,
// other write parameters (writeValueType, writeStart, writeType) can be omitted
Thing data rollershutterData [ readStart="0", readValueType="int16", writeTransform="JS:rollershutter.js" ]
Thing data rollershutterData [ readStart="0", readValueType="int16", writeTransform="JS(rollershutter.js)" ]

// For diagnostics
Thing data rollershutterDebug0 [ readStart="0", readValueType="int16", writeStart="0", writeValueType="int16", writeType="holding" ]
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70 changes: 0 additions & 70 deletions ...us/src/main/java/org/openhab/binding/modbus/internal/CascadedValueTransformationImpl.java
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