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Getting Started
Interface
Engine
DCode
- Overview
- Values and Scope
- Common Syntax and Functions
- Runtime Blocks and Activation
- Tasks
- Timelines
- Loops
- Channel Calculations
- Callbacks
- Events
- Templates and Configuration
- Modules and Native Functions
- Native C++ Execution
- Reference
  - Blocks
    
    Blocks
    do
    elif
    else
    elseif
    for
    for each
    function
    if
    once
    when
    while
  - Context Variables
    
    Context Variables
    current_state
    current_value
    elapsed_seconds
    lateness_ms
    missed_count
    new_value
    state
    states
    target_state
    value
  - DCode Functions
    
    abort
    callDcodeCallback
    callDcodeFunction
    clamp
    copy
    DCode Functions
    error
    has
    hold
    insertChannelReference
    items
    json.parse
    json.stringify
    keys
    len
    log
    log_error
    log_warning
    lookup
    message
    print
    promptNumerical
    promptOptions
    promptString
    promptYesNo
    queryChannelReference
    releaseHold
    startDataFrame
    startDcodeCallback
    stop_event_firing
    stopDataFrame
    tempest_operation
    tempest_pinned_operation
    tempest_publish
    upsertChannelReference
    values
    wait
    wait_until
    warning
  - DCode Reference
  - Directives
    
    Directives
    import
    params = yaml
    template(params)
  - Fields
    
    auto_acknowledge
    channels
    clock_start
    clock_t0
    depends_on
    description
    Fields
    firing_timeout_seconds
    hold_at
    resolution
    run
    states
    subsystem
    system
    title
    type
  - Handlers
    
    abort
    execute
    Handlers
    hold
    on_event
    on_firing
    resume
    stop
    trigger
  - Lua Base
    
    _G
    _VERSION
    and
    assert
    collectgarbage
    coroutine
    debug
    dofile
    false
    getmetatable
    goto
    in
    io
    ipairs
    load
    loadfile
    Lua Base
    math
    next
    nil
    not
    or
    os
    package
    pairs
    pcall
    rawequal
    rawget
    rawlen
    rawset
    repeat
    require
    select
    setmetatable
    string
    table
    tonumber
    tostring
    true
    type
    until
    utf8
    xpcall
  - Runtime Blocks
    
    callback
    channel_calculation
    event
    loop
    Runtime Blocks
    task_group
    task_periodic
    task_sequence
    task_state_machine
    task_timeline
  - Runtime Sections
    
    abort
    at
    end
    hold
    loop body
    missed
    resume
    Runtime Sections
    sequence body
    start
    state
    stop
    task
  - Statements
    
    automatic override
    break
    claim channel
    command channel
    free channel
    global
    local
    pass
    pipe write
    return
    set channel
    Statements
    transition
    transition task
    trigger event
  - Syntax
    
    arrays and objects
    block comments
    colon and indentation
    dash comments
    DCode expressions
    dynamic channel reference
    hash comments
    null
    pipe read
    Syntax
Plugins
Clients

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Covers Engine 2.0.0

claim channel

Legacy alias for value-free command. Prefer command |channel|.

Syntax

claim |channel|

Available in

File scope
Executable DCode bodies

Example

claim |channel|

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