Changeset 68:0e7cc0795386 in xplra


Ignore:
Timestamp:
04/11/13 18:25:27 (12 years ago)
Author:
István Váradi <ivaradi@…>
Branch:
default
Phase:
public
Message:

Completed the documentation on the protocol

File:
1 edited

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Unmodified
Added
Removed

  • doc/overview.dox

    r67 r68  
    4343 * the reply, e.g. the data queried or a parameter to an error code.
    4444 *
    45  * \section protodata Protocol data types
     45 * \section protodata Types of protocol data elements
    4646 *
    4747 * The protocol's basic data elements are: 8-, 16- and 32-bit signed
    … …  
    6363 * - 90000 => 0x90 0xbf 0x05
    6464 *
     65 * \section datatypes Data type codes
     66 *
     67 * Each dataref of X-Plane has a certain data type, and some datarefs
     68 * can represent their values in multiple data types. Because of this
     69 * ambiguity and the fact that users should know the data type anyway,
     70 * especially when using a strongly typed language, the type should be
     71 * sent with the dataref name in commands that refer to one or more
     72 * datarefs.
     73 *
     74 * Each data type is represented as an 8-bit unsigned integer, whose
     75 * possible values are given in the table below:
     76 *
     77 * Data type | Value | Constant name
     78 * --------- | ----: | -------------
     79 * 32-bit signed integer | 0x01 | \anchor TYPE_INT TYPE_INT
     80 * single-precision floating-point value | 0x02 | \anchor TYPE_FLOAT TYPE_FLOAT
     81 * double-precision floating-point value | 0x03 | \anchor TYPE_DOUBLE TYPE_DOUBLE
     82 * array of single-precision floating-point values | 0x11 | \anchor TYPE_FLOAT_ARRAY TYPE_FLOAT_ARRAY
     83 * array of 32-bit signed integers | 0x12 | \anchor TYPE_INT_ARRAY TYPE_INT_ARRAY
     84 * array of 8-bit unsigned integers (bytes) | 0x13 | \anchor TYPE_BYTE_ARRAY TYPE_BYTE_ARRAY
     85 *
     86 * The constant name is the name used in both client APIs to identify
     87 * the given type.
     88 *
     89 * The scalar data types are encoded as in the following table:
     90 *
     91 * Data type constant | Encoding
     92 * ------------------ | --------
     93 * \ref TYPE_INT | a 32-bit (4-byte) signed integer
     94 * \ref TYPE_FLOAT | a 32-bit (4-byte) IEEE 754 single-precision floating point value
     95 * \ref TYPE_DOUBLE | a 64-bit (8-byte) IEEE 754 double-precision floating point value
     96 *
     97 * The contents of an array is encoded as a sequence of values of the
     98 * items' type. It is usually preceded by a 32-bit signed integer
     99 * denoting the number of items and sometimes also by another 32-bit
     100 * signed integer denoting the offset into the array.
     101 *
     102 * \section resultcodes Result codes
     103 *
     104 * The first byte of the reply message to each command is a result
     105 * code. If the command could be executed properly, it is RESULT_OK
     106 * followed by the results of the command if any, otherwise it is
     107 * another code signifying some error. Most error codes are followed
     108 * by no further data, but \ref RESULT_UNKNOWN_DATAREF may be followed by
     109 * an index if a multi-dataref request is issued.
     110 *
     111 * The table summarizes the error codes:
     112 *
     113 * Meaning | Value | Constant name
     114 * ------- | ----- | -------------
     115 * Success, everything is OK | 0x00 | \anchor RESULT_OK RESULT_OK
     116 * Invalid command | 0x01 | \anchor RESULT_INVALID_COMMAND RESULT_INVALID_COMMAND
     117 * Unknown dataref | 0x02 | \anchor RESULT_UNKNOWN_DATAREF RESULT_UNKNOWN_DATAREF
     118 * Invalid data type | 0x03 | \anchor RESULT_INVALID_TYPE RESULT_INVALID_TYPE
     119 * Invalid length | 0x04 | \anchor RESULT_INVALID_LENGTH RESULT_INVALID_LENGTH
     120 * Invalid offset | 0x05 | \anchor RESULT_INVALID_OFFSET RESULT_INVALID_OFFSET
     121 * Invalid count | 0x06 | \anchor RESULT_INVALID_COUNT RESULT_INVALID_COUNT
     122 * Invalid ID | 0x07 | \anchor RESULT_INVALID_ID RESULT_INVALID_ID
     123 * Invalid duration | 0x08 | \anchor RESULT_INVALID_DURATION RESULT_INVALID_DURATION
     124 * Other error | 0xff | \anchor RESULT_OTHER_ERROR RESULT_OTHER_ERROR
     125 *
     126 * \section limits Limits
     127 *
     128 * Certain parameters have limits, which are summarized in the
     129 * following table:
     130 *
     131 * Description | Limit
     132 * ------- | -----
     133 * maximal number of array items | 2048
     134 * maximal number of datarefs in a multi-dataref operation | 1024
     135 * maximal duration of a message | 5 minutes
     136 * maximal number of hotkeys that can be registered | 128
     137 *
    65138 * \section commands Commands
    66139 *
    67140 * This section describes the commands of the protocol with their
    68  * parameters and the possible replies.
    69  *
    70  * \subsection command_get_single The GET_SINGLE command (0x01)
     141 * parameters and the possible replies. Each command is represented by
     142 * an 8-bit unsigned value, which is the first byte of the
     143 * message. The table below summarizes the commands with their command
     144 * byte and constant names:
     145 *
     146 * Description | Command byte | Constant Name
     147 * ----------- | -----------: | -------------
     148 * \ref command_get_single "Query the value of a single dataref" | 0x01 | \anchor COMMAND_GET_SINGLE COMMAND_GET_SINGLE
     149 * \ref command_set_single "Set the value of a single dataref" | 0x02 | \anchor COMMAND_SET_SINGLE COMMAND_SET_SINGLE
     150 * \ref command_get_multi "Query the values of multiple datarefs" | 0x03 | \anchor COMMAND_GET_MULTI COMMAND_GET_MULTI
     151 * \ref command_set_multi "Set the values of multiple datarefs" | 0x04 | \anchor COMMAND_SET_MULTI COMMAND_SET_MULTI
     152 * \ref command_register_get_multi "Register a multi-dataref query" | 0x11 | \anchor COMMAND_REGISTER_GET_MULTI COMMAND_REGISTER_GET_MULTI
     153 * \ref command_unregister_get_multi "Unregister a multi-dataref query" | 0x12 | \anchor COMMAND_UNREGISTER_GET_MULTI COMMAND_UNREGISTER_GET_MULTI
     154 * \ref command_execute_get_multi "Execute a registered multi-dataref query" | 0x13 | \anchor COMMAND_EXECUTE_GET_MULTI COMMAND_EXECUTE_GET_MULTI
     155 * \ref command_register_set_multi "Register a multi-dataref update request" | 0x21 | \anchor COMMAND_REGISTER_SET_MULTI COMMAND_REGISTER_SET_MULTI
     156 * \ref command_unregister_set_multi "Unregister a multi-dataref update request" | 0x22 | \anchor COMMAND_UNREGISTER_SET_MULTI COMMAND_UNREGISTER_SET_MULTI
     157 * \ref command_execute_set_multi "Execute a registered multi-dataref update request" | 0x23 | \anchor COMMAND_EXECUTE_SET_MULTI COMMAND_EXECUTE_SET_MULTI
     158 * \ref command_get_versions "Query the versions of X-Plane, XPLM and XPLRA" | 0x31 | \anchor COMMAND_GET_VERSIONS COMMAND_GET_VERSIONS
     159 * \ref command_reload_plugins "Reload the plugins in X-Plane" | 0x32 | \anchor COMMAND_RELOAD_PLUGINS COMMAND_RELOAD_PLUGINS
     160 * \ref command_show_message "Show a message in X-Plane's window" | 0x41 | \anchor COMMAND_SHOW_MESSAGE COMMAND_SHOW_MESSAGE
     161 * \ref command_register_hotkeys "Register hotkeys to be listened to" | 0x51 | \anchor COMMAND_REGISTER_HOTKEYS COMMAND_REGISTER_HOTKEYS
     162 * \ref command_query_hotkeys "Query the sate of the registered hotkeys" | 0x52 | \anchor COMMAND_QUERY_HOTKEYS COMMAND_QUERY_HOTKEYS
     163 * \ref command_unregister_hotkeys "Unregister the previously registered hotkets" | 0x53 | \anchor COMMAND_UNREGISTER_HOTKEYS COMMAND_UNREGISTER_HOTKEYS
     164 *
     165 * \subsection command_get_single The GET_SINGLE command
    71166 *
    72167 * This command can be used to query the value of a single
    … …  
    74169 * double) or an array of floats, integers or bytes.
    75170 *
    76  * The command byte  is followed by the following data:
    77  * - the name of the dataref to query (string)
    78  * - the type of the dataref (8-bit unsigned, one of the \c TYPE_XXX
    79  * constants). If the type is an array:
    80  * - the length of the data to query (32-bit signed integer, -1 to use
    81  * the full length of the data)
    82  * - the offset of the data to query (32-bit signed integer)
    83  *
    84  * The reply consists of the following:
    85  * - the result code (8-bit unsigned, one of the \c RESULT_XXX constants)
    86  *
    87  * If the result code is \ref RESULT_OK, it is followed by the value.
    88  *
    89  * For scalars it is:
    90  * - the value of the dataref:
    91  *   - a 32-bit signed integer for an integer,
    92  *   - a 32-bit single-precision floating point value for a float, or
    93  *   - a 64-bit double-precision floating point value for a double.
    94  *
    95  * For arrays it is:
    96  * - the number of items in the array (32-bit signed integer)
    97  * - the data items making up the array:
    98  *   - 32-bit single-precision floating point values for a float array,
    99  *   - 32-bit signed integer values for an integer array, or
    100  *   - 8-bit unsigned integer values for a byte array (or as you want
    101  *     to interpret it).
     171 * The format of the command is the following:
     172 *
     173 * Type | Description
     174 * ---- | ------
     175 * byte | 0x01 (\ref COMMAND_GET_SINGLE)
     176 * dataref_query_info | information about the dataref to query
     177 *
     178 * \anchor dataref_query_info \c dataref_query_info has the following
     179 * format for scalar types:
     180 *
     181 * Type | Description
     182 * ---- | ------
     183 * string | the name of the dataref to query
     184 * byte | the type of the dataref, one of the \ref datatypes "TYPE_XXX" constants
     185 *
     186 * \c dataref_query_info has the following format for array types:
     187 *
     188 * Type | Description
     189 * ---- | ------
     190 * string | the name of the dataref to query
     191 * byte | the type of the dataref, one of the \ref datatypes "TYPE_XXX_ARRAY" constants
     192 * 32-bit signed integer | the number of items to query, -1 to query all items
     193 * 32-bit signed integer | the offset of the data within the array to query
     194 *
     195 * If the command is executed successfully, the reply has the
     196 * following format for scalar types:
     197 *
     198 * Type | Description
     199 * ---- | ------
     200 * byte | 0x00 (\ref RESULT_OK)
     201 * dataref_value | the value of the dataref
     202 *
     203 * \anchor dataref_value dataref_value is encoded as follows for scalar types:
     204 *
     205 * Type | Description
     206 * ---- | ------
     207 * scalar type | the value of the dataref
     208 *
     209 * dataref_value is encoded as follows for array types:
     210 *
     211 * Type | Description
     212 * ---- | ------
     213 * 32-bit signed integer | n=the number of items returned
     214 * n*type of the items | the data items themselves
     215 *
     216 * In case of an error:
     217 *
     218 * Type | Description
     219 * ---- | ------
     220 * byte | the error code
     221 *
     222 * The following error codes may be returned:
     223 *
     224 * Code | Meaning
     225 * ---- | -------
     226 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     227 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     228 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large
     229 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     230 *
     231 * \subsection command_set_single The SET_SINGLE command
     232 *
     233 * This command can be used to set the value of a single
     234 * dataref. Such a data can either be a scalar (integer, float or
     235 * double) or an array of floats, integers or bytes.
     236 *
     237 * The format of the command is the following for scalar values:
     238 *
     239 * Type | Description
     240 * ---- | ------
     241 * byte | 0x02 (\ref COMMAND_SET_SINGLE)
     242 * dataref_update_info | information about the dataref to set and the value itself
     243 *
     244 * \anchor dataref_update_info \c dataref_update_info has the
     245 * following format for scalar values:
     246 *
     247 * Type | Description
     248 * ---- | ------
     249 * string | the name of the dataref to set
     250 * byte | the type of the dataref, one of the \ref datatypes "TYPE_XXX" constants
     251 * dataref's type | the value to set
     252 *
     253 * \c dataref_update_info has the following format for array values:
     254 *
     255 * Type | Description
     256 * ---- | ------
     257 * string | the name of the dataref to set
     258 * byte | the type of the dataref, one of the \ref datatypes "TYPE_XXX_ARRAY" constants
     259 * 32-bit signed integer | n=the number of items to set
     260 * 32-bit signed integer | the offset from which to set the values
     261 * n*type of the items | the actual values of the array
     262 *
     263 * If the command is executed successfully, the reply has the
     264 * following format for scalar types:
     265 *
     266 * Type | Description
     267 * ---- | ------
     268 * byte | 0x00 (\ref RESULT_OK)
     269 *
     270 * If an error was encountered, the reply has the following format:
     271 *
     272 * Type | Description
     273 * ---- | ------
     274 * byte | the error code
     275 *
     276 * The following error codes may be returned:
     277 *
     278 * Code | Meaning
     279 * ---- | -------
     280 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     281 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     282 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large or not positive
     283 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     284 *
     285 * \subsection command_get_multi The GET_MULTI command
     286 *
     287 * This command can be used to query the values of several datarefs in
     288 * one call. It is encoded as follows:
     289 *
     290 * Type | Description
     291 * ---- | ------
     292 * byte | 0x03 (\ref COMMAND_GET_MULTI)
     293 * 32-bit unsigned integer | n=the number of datarefs to query
     294 * n*\ref dataref_query_info | information about the datarefs to query.
     295 *
     296 * In case of success, the reply is the following:
     297 *
     298 * Type | Description
     299 * ---- | ------
     300 * byte | 0x00 (\ref RESULT_OK)
     301 * n*\ref dataref_value | the values of the datarefs
     302 *
     303 * If an error was encountered, the reply has the following format:
     304 *
     305 * Type | Description
     306 * ---- | ------
     307 * byte | the error code
     308 * 32-bit unsigned integer | if the error code is \ref RESULT_UNKNOWN_DATAREF : the 0-based index of the first dataref that was not found
     309 *
     310 * The following error codes may be returned:
     311 *
     312 * Code | Meaning
     313 * ---- | -------
     314 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     315 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     316 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large
     317 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     318 * \ref RESULT_INVALID_COUNT | the number of datarefs was either 0 or too large
     319 *
     320 * \subsection command_set_multi The SET_MULTI command
     321 *
     322 * This command can be used to set the values of several datarefs in
     323 * one call. It is encoded as follows:
     324 *
     325 * Type | Description
     326 * ---- | ------
     327 * byte | 0x04 (\ref COMMAND_SET_MULTI)
     328 * 32-bit unsigned integer | n=the number of datarefs to set
     329 * n*\ref dataref_update_info | information about the datarefs to set
     330 *
     331 * In case of success, the reply is the following:
     332 *
     333 * Type | Description
     334 * ---- | ------
     335 * byte | 0x00 (\ref RESULT_OK)
     336 *
     337 * If an error was encountered, the reply has the following format:
     338 *
     339 * Type | Description
     340 * ---- | ------
     341 * byte | the error code
     342 * 32-bit unsigned integer | if the error code is \ref RESULT_UNKNOWN_DATAREF : the 0-based index of the first dataref that was not found
     343 *
     344 * The following error codes may be returned:
     345 *
     346 * Code | Meaning
     347 * ---- | -------
     348 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     349 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     350 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large or not positive
     351 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     352 * \ref RESULT_INVALID_COUNT | the number of datarefs was either 0 or too large
     353 *
     354 * \subsection command_register_get_multi The REGISTER_GET_MULTI command
     355 *
     356 * This command can be used to register a multi-dataref query. A
     357 * multi-dataref query is a list of datarefs that are queried
     358 * together. The query will be associated with an identifier that can
     359 * be used later to refer to the query when actually querying the
     360 * values or when unregistering it. The identifier is unique only for
     361 * the client connection and among the multi-dataref queries.
     362 *
     363 * Type | Description
     364 * ---- | ------
     365 * byte | 0x11 (\ref COMMAND_REGISTER_GET_MULTI)
     366 * 32-bit unsigned integer | n=the number of datarefs to query
     367 * n*\ref dataref_query_info | information about the datarefs to query.
     368 *
     369 * In case of success, the reply is the following:
     370 *
     371 * Type | Description
     372 * ---- | ------
     373 * byte | 0x00 (\ref RESULT_OK)
     374 * 32-bit unsigned integer | the identifier of the registered query
     375 *
     376 * If an error was encountered, the reply has the following format:
     377 *
     378 * Type | Description
     379 * ---- | ------
     380 * byte | the error code
     381 *
     382 * The following error codes may be returned:
     383 *
     384 * Code | Meaning
     385 * ---- | -------
     386 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     387 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large
     388 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     389 * \ref RESULT_INVALID_COUNT | the number of datarefs was either 0 or too large
     390 *
     391 * \subsection command_unregister_get_multi The UNREGISTER_GET_MULTI command
     392 *
     393 * This command can be used to unregister a previously registered
     394 * multi-dataref query.
     395 *
     396 * Type | Description
     397 * ---- | ------
     398 * byte | 0x12 (\ref COMMAND_UNREGISTER_GET_MULTI)
     399 * 32-bit unsigned integer | the identifier of the query to unregister
     400 *
     401 * In case of success, the reply is the following:
     402 *
     403 * Type | Description
     404 * ---- | ------
     405 * byte | 0x00 (\ref RESULT_OK)
     406 *
     407 * If an error was encountered, the reply has the following format:
     408 *
     409 * Type | Description
     410 * ---- | ------
     411 * byte | the error code
     412 *
     413 * The following error codes may be returned:
     414 *
     415 * Code | Meaning
     416 * ---- | -------
     417 * \ref RESULT_INVALID_ID | an identifier was given that is not associated with any registered query
     418 *
     419 * \subsection command_execute_get_multi The EXECUTE_GET_MULTI command
     420 *
     421 * This command can be used to execute a previously registered
     422 * multi-dataref query.
     423 *
     424 * Type | Description
     425 * ---- | ------
     426 * byte | 0x13 (\ref COMMAND_EXECUTE_GET_MULTI)
     427 * 32-bit unsigned integer | the identifier of the query to execute
     428 *
     429 * In case of success, the reply is the following:
     430 *
     431 * Type | Description
     432 * ---- | ------
     433 * byte | 0x00 (\ref RESULT_OK)
     434 * n*\ref dataref_value | the values of the datarefs, n is the number of them
     435 *
     436 * If an error was encountered, the reply has the following format:
     437 *
     438 * Type | Description
     439 * ---- | ------
     440 * byte | the error code
     441 * 32-bit unsigned integer | if the error code is \ref RESULT_UNKNOWN_DATAREF : the 0-based index of the first dataref that was not found
     442 *
     443 * The following error codes may be returned:
     444 *
     445 * Code | Meaning
     446 * ---- | -------
     447 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     448 * \ref RESULT_INVALID_ID | an identifier was given that is not associated with any registered query
     449 *
     450 * \subsection command_register_set_multi The REGISTER_SET_MULTI command
     451 *
     452 * This command can be used to register a multi-dataref update. A
     453 * multi-dataref update is a list of datarefs that are updated
     454 * together with values supplied for each update. The update will be
     455 * associated with an identifier that can be used later to refer to
     456 * the update when actually updating the values or when unregistering
     457 * it. The identifier is unique only for  the client connection and
     458 * among the multi-dataref updates.
     459 *
     460 * Type | Description
     461 * ---- | ------
     462 * byte | 0x21 (\ref COMMAND_REGISTER_SET_MULTI)
     463 * 32-bit unsigned integer | n=the number of datarefs to query
     464 * n*\ref dataref_query_info | information about the datarefs to update (this \a is \ref dataref_query_info, because the format is the same, since we don't supply any values)
     465 *
     466 * In case of success, the reply is the following:
     467 *
     468 * Type | Description
     469 * ---- | ------
     470 * byte | 0x00 (\ref RESULT_OK)
     471 * 32-bit unsigned integer | the identifier of the registered query
     472 *
     473 * If an error was encountered, the reply has the following format:
     474 *
     475 * Type | Description
     476 * ---- | ------
     477 * byte | the error code
     478 *
     479 * The following error codes may be returned:
     480 *
     481 * Code | Meaning
     482 * ---- | -------
     483 * \ref RESULT_INVALID_TYPE | an unknown type code was given
     484 * \ref RESULT_INVALID_LENGTH | the length given for an array is too large or not positive
     485 * \ref RESULT_INVALID_OFFSET | the offset given for an array is negative
     486 * \ref RESULT_INVALID_COUNT | the number of datarefs was either 0 or too large
     487 *
     488 * \subsection command_unregister_set_multi The UNREGISTER_GET_MULTI command
     489 *
     490 * This command can be used to unregister a previously registered
     491 * multi-dataref update.
     492 *
     493 * Type | Description
     494 * ---- | ------
     495 * byte | 0x22 (\ref COMMAND_UNREGISTER_SET_MULTI)
     496 * 32-bit unsigned integer | the identifier of the update to unregister
     497 *
     498 * In case of success, the reply is the following:
     499 *
     500 * Type | Description
     501 * ---- | ------
     502 * byte | 0x00 (\ref RESULT_OK)
     503 *
     504 * If an error was encountered, the reply has the following format:
     505 *
     506 * Type | Description
     507 * ---- | ------
     508 * byte | the error code
     509 *
     510 * The following error codes may be returned:
     511 *
     512 * Code | Meaning
     513 * ---- | -------
     514 * \ref RESULT_INVALID_ID | an identifier was given that is not associated with any registered update
     515 *
     516 * \subsection command_execute_set_multi The EXECUTE_SET_MULTI command
     517 *
     518 * This command can be used to execute a previously registered
     519 * multi-dataref update.
     520 *
     521 * Type | Description
     522 * ---- | ------
     523 * byte | 0x23 (\ref COMMAND_EXECUTE_SET_MULTI)
     524 * 32-bit unsigned integer | the identifier of the update to execute
     525 * n*\ref dataref_value | the values
     526 *
     527 * In case of success, the reply is the following:
     528 *
     529 * Type | Description
     530 * ---- | ------
     531 * byte | 0x00 (\ref RESULT_OK)
     532 *
     533 * If an error was encountered, the reply has the following format:
     534 *
     535 * Type | Description
     536 * ---- | ------
     537 * byte | the error code
     538 * 32-bit unsigned integer | if the error code is \ref RESULT_UNKNOWN_DATAREF : the 0-based index of the first dataref that was not found
     539 *
     540 * The following error codes may be returned:
     541 *
     542 * Code | Meaning
     543 * ---- | -------
     544 * \ref RESULT_UNKNOWN_DATAREF | the dataref with the given name was not found
     545 * \ref RESULT_INVALID_ID | an identifier was given that is not associated with any registered query
     546 *
     547 * \subsection command_get_versions The GET_VERSIONS command
     548 *
     549 * This command can be used to query the versions of X-Plane, XPLM and
     550 * XPLRA itself.
     551 *
     552 * Type | Description
     553 * ---- | ------
     554 * byte | 0x31 (\ref COMMAND_GET_VERSIONS)
     555 *
     556 * The reply is encoded the following way (it shall never fail):
     557 *
     558 * Type | Description
     559 * ---- | ------
     560 * byte | 0x00 (\ref RESULT_OK)
     561 * 32-bit signed integer | the version of X-Plane. For 10.20r1 it is 10201.
     562 * 32-bit signed integer | the version of XPLM. For 2.10 it is 210.
     563 * 32-bit signed integer | the version of XPLRA. For 0.1 it is 10.
     564 *
     565 * \subsection command_reload_plugins The RELOAD_PLUGINS command
     566 *
     567 * This command can be used to reload the plugins in X-Plane. This is
     568 * useful for debugging.
     569 *
     570 * Type | Description
     571 * ---- | ------
     572 * byte | 0x32 (\ref COMMAND_RELOAD_PLUGINS)
     573 *
     574 * The reply is encoded the following way (it shall never fail):
     575 *
     576 * Type | Description
     577 * ---- | ------
     578 * byte | 0x00 (\ref RESULT_OK)
     579 *
     580 * \subsection command_get_versions The GET_VERSIONS command
     581 *
     582 * This command can be used to query the versions of X-Plane, XPLM and
     583 * XPLRA itself.
     584 *
     585 * Type | Description
     586 * ---- | ------
     587 * byte | 0x31 (\ref COMMAND_GET_VERSIONS)
     588 *
     589 * The reply is encoded the following way (it shall never fail):
     590 *
     591 * Type | Description
     592 * ---- | ------
     593 * byte | 0x00 (\ref RESULT_OK)
     594 * 32-bit signed integer | the version of X-Plane. For 10.20r1 it is 10201.
     595 * 32-bit signed integer | the version of XPLM. For 2.10 it is 210.
     596 * 32-bit signed integer | the version of XPLRA. For 0.1 it is 10.
     597 *
     598 * \subsection command_show_message The SHOW_MESSAGE command
     599 *
     600 * This command can be used to show a message in a window to the
     601 * user. The window is a single line window around the top 1/3rd of
     602 * the screen. It can be moved and resized by mouse actions. If a
     603 * message is being displayed when this command is issued, that
     604 * message will be replaced by the new one.
     605 *
     606 * Type | Description
     607 * ---- | ------
     608 * byte | 0x41 (\ref COMMAND_SHOW_MESSAGE)
     609 * string | the message to show
     610 * float | the duration of the message in seconds
     611 *
     612 * If successful, the reply is the following:
     613 *
     614 * Type | Description
     615 * ---- | ------
     616 * byte | 0x00 (\ref RESULT_OK)
     617 *
     618 * If an error was encountered, the reply has the following format:
     619 *
     620 * Type | Description
     621 * ---- | ------
     622 * byte | the error code
     623 *
     624 * The following error codes may be returned:
     625 *
     626 * Code | Meaning
     627 * ---- | -------
     628 * \ref RESULT_INVALID_DURATION | the duration is too large
     629 *
     630 * \subsection command_register_hotkeys The REGISTER_HOTKEYS command
     631 *
     632 * This command can be used to register a set of hotkeys to be
     633 * monitored. If any other hotkeys have been registered by the current
     634 * client previously, they are forgotten.
     635 *
     636 * Type | Description
     637 * ---- | ------
     638 * byte | 0x51 (\ref COMMAND_REGISTER_HOTKEYS)
     639 * 32-bit unsigned integer | n=the number of the hotkeys
     640 * n * 16-bit unsigned integer | the codes of the hotkeys
     641 *
     642 * The lower-byte of a hotkey code is the same as the X-Plane virtual
     643 * key code. The upper byte is a logical OR of zero or more modifiers:
     644 *
     645 * Value | Description | Constant name
     646 * --: | --- | ---
     647 * 0x0100 | Shift modifier | HOTKEY_MODIFIER_SHIFT
     648 * 0x0200 | Control modifier | HOTKEY_MODIFIER_CONTROL
     649 *
     650 * If successful, the reply is the following:
     651 *
     652 * Type | Description
     653 * ---- | ------
     654 * byte | 0x00 (\ref RESULT_OK)
     655 *
     656 * If an error was encountered, the reply has the following format:
     657 *
     658 * Type | Description
     659 * ---- | ------
     660 * byte | the error code
     661 *
     662 * The following error codes may be returned:
     663 *
     664 * Code | Meaning
     665 * ---- | -------
     666 * \ref RESULT_INVALID_LENGTH | too many hotkeys were given
     667 *
     668 * \subsection command_query_hotkeys The QUERY_HOTKEYS command
     669 *
     670 * This command can be used to query which hotkeys have been pressed
     671 * since the last query.
     672 *
     673 * Type | Description
     674 * ---- | ------
     675 * byte | 0x52 (\ref COMMAND_QUERY_HOTKEYS)
     676 *
     677 * The reply is the following:
     678 *
     679 * Type | Description
     680 * ---- | ------
     681 * byte | 0x00 (\ref RESULT_OK)
     682 * 32-bit unsigned integer | n = the number of hotkeys registered
     683 * n * 8-bit unsigned integer | each byte is 0 or 1 depending whether the corresponding hotkeys was pressed or not. The value at index i corresponds to the hotkey code at index i in the array passed with \ref command_register_hotkeys "COMMAND_REGISTER_HOTKEYS"
     684 *
     685 * \subsection command_unregister_hotkeys The UNREGISTER_HOTKEYS command
     686 *
     687 * This command can be used to unregister a previously registered set
     688 * of hotkeys to be  monitored.
     689 *
     690 * Type | Description
     691 * ---- | ------
     692 * byte | 0x53 (\ref COMMAND_UNREGISTER_HOTKEYS)
     693 *
     694 * The reply is the following:
     695 *
     696 * Type | Description
     697 * ---- | ------
     698 * byte | 0x00 (\ref RESULT_OK)
    102699 */
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