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Copyright © 2015 The Linux Foundation. All rights reserved.

Linux Foundation, Linux Standard Base, LSB, LSB Certified, IAccessible2, MeeGo are registered trademarks of the Linux Foundation.

Linux is a registered trademark of Linus Torvalds. Please see our privacy policy.

/*
 * Copyright (C) 2016 "IoT.bzh"
 * Author Fulup Ar Foll <fulup@iot.bzh>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * references:
 *   https://gist.github.com/ghedo/963382
 *   http://alsa-utils.sourcearchive.com/documentation/1.0.15/aplay_8c-source.html
 */

#define _GNU_SOURCE

#define BUFFER_FRAME_COUNT 10 /* max frames in buffer */
#define WAIT_TIMER_US 1000000 /* default waiting timer 1s */
#define I2C_MAX_DATA_SZ    32 /* max. number of bytes to be written to i2c */
#define CTRL_MAX_DATA_SZ   45 /* max. number of bytes to be written to control
                               * channel */

#include <systemd/sd-event.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>

#include "ucs_binding.h"
#include "ucs_interface.h"

#define MAX_FILENAME_LEN (100)
#define RX_BUFFER (64)
#define XML_CONFIG_FOLDER "/var/"
#define XML_CONFIG_FILE "config_multichannel_audio_kit.xml"

/** Internal structure, enabling multiple instances of this component.
 * \note Do not access any of this variables.
 *  */
typedef struct {
    int fileHandle;
    int fileFlags;
    char fileName[MAX_FILENAME_LEN];
    uint8_t rxBuffer[RX_BUFFER];
    uint32_t rxLen;
} CdevData_t;


typedef struct {
  CdevData_t rx;
  CdevData_t tx;
  UCSI_Data_t ucsiData;
  UcsXmlVal_t* ucsConfig;
} ucsContextT;

typedef struct {
    struct afb_event node_event;
} EventData_t;

typedef struct {
    struct afb_event rx_event;
} EventDataRx_t;

static ucsContextT *ucsContextS = NULL;
static EventData_t *eventData = NULL;
static EventDataRx_t *eventDataRx = NULL;

PUBLIC void UcsXml_CB_OnError(const char format[], uint16_t vargsCnt, ...) {
    /*AFB_DEBUG (afbIface, format, args); */
    va_list args;
    va_start (args, vargsCnt);
    vfprintf (stderr, format, args);
    va_end(args);

    va_list argptr;
    char outbuf[300];
    va_start(argptr, vargsCnt);
    vsprintf(outbuf, format, argptr);
    va_end(argptr);
    AFB_WARNING ("%s", outbuf);
}

PUBLIC uint16_t UCSI_CB_OnGetTime(void *pTag) {
    struct timespec currentTime;
    uint16_t timer;
    pTag = pTag;

    if (clock_gettime(CLOCK_MONOTONIC_RAW, &currentTime))   {
        assert(false);
        return 0;
    }

    timer = (uint16_t) ((currentTime.tv_sec * 1000 ) + ( currentTime.tv_nsec / 1000000 ));
    return(timer);
}

STATIC int onTimerCB (sd_event_source* source,uint64_t timer, void* pTag) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;

    sd_event_source_unref(source);
    UCSI_Timeout(&ucsContext->ucsiData);

    return 0;
}

void UCSI_CB_OnNetworkState(void *pTag, bool isAvailable, uint16_t packetBandwidth, uint8_t amountOfNodes)
{
    AFB_NOTICE ("Network is available=%d, bw=%d, nodeCnt=%d", isAvailable, packetBandwidth, amountOfNodes);
}

/* UCS2 Interface Timer Callback */
PUBLIC void UCSI_CB_OnSetServiceTimer(void *pTag, uint16_t timeout) {
  uint64_t usec;
  /* set a timer with  250ms accuracy */
  sd_event_now(afb_daemon_get_event_loop(), CLOCK_BOOTTIME, &usec);
  sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, usec + (timeout*1000), 250, onTimerCB, pTag);

}

/**
 * \brief Callback when ever an Unicens forms a human readable message.
 *        This can be error events or when enabled also debug messages.
 * \note This function must be implemented by the integrator
 * \param pTag - Pointer given by the integrator by UCSI_Init
 * \param format - Zero terminated format string (following printf rules)
 * \param vargsCnt - Amount of parameters stored in "..."
 */
void UCSI_CB_OnUserMessage(void *pTag, bool isError, const char format[],
    uint16_t vargsCnt, ...) {
    va_list argptr;
    char outbuf[300];
    pTag = pTag;
    va_start(argptr, vargsCnt);
    vsprintf(outbuf, format, argptr);
    va_end(argptr);
    AFB_NOTICE ("%s",outbuf);
}

/** UCSI_Service cannot be called directly within UNICENS context, need to service stack through mainloop */
STATIC int OnServiceRequiredCB (sd_event_source *source, uint64_t usec, void *pTag) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;

    sd_event_source_unref(source);
    UCSI_Service(&ucsContext->ucsiData);
    return (0);
}

/* UCS Callback fire when ever UNICENS needs to be serviced */
PUBLIC void UCSI_CB_OnServiceRequired(void *pTag) {

   /* push an asynchronous request for loopback to call UCSI_Service */
   sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, 0, 0, OnServiceRequiredCB, pTag);
}

/* Callback when ever this UNICENS wants to send a message to INIC. */
PUBLIC void UCSI_CB_OnTxRequest(void *pTag, const uint8_t *pData, uint32_t len) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;
    CdevData_t *cdevTx = &ucsContext->tx;
    uint32_t total = 0;

    if (NULL == pData || 0 == len) return;

    if (O_RDONLY == cdevTx->fileFlags) return;
    if (-1 == cdevTx->fileHandle)
        cdevTx->fileHandle = open(cdevTx->fileName, cdevTx->fileFlags);
    if (-1 == cdevTx->fileHandle)
        return;

    while(total < len) {
        ssize_t written = write(cdevTx->fileHandle, &pData[total], (len - total));
        if (0 >= written)
        {
            /* Silently ignore write error (only occur in non-blocking mode) */
            break;
        }
        total += (uint32_t) written;
    }
}

/** UcsXml_FreeVal be called directly within UNICENS context, need to service stack through mainloop */
STATIC int OnStopCB (sd_event_source *source, uint64_t usec, void *pTag) {
    if (NULL != ucsContextS && NULL != ucsContextS->ucsConfig) {
        UcsXml_FreeVal(ucsContextS->ucsConfig);
        ucsContextS->ucsConfig = NULL;
    }
    return 0;
}

/**
 * \brief Callback when UNICENS instance has been stopped.
 * \note This event can be used to free memory holding the resources
 *       passed with UCSI_NewConfig
 * \note This function must be implemented by the integrator
 * \param pTag - Pointer given by the integrator by UCSI_Init
 */
void UCSI_CB_OnStop(void *pTag) {
   AFB_NOTICE ("UNICENS stopped");
   /* push an asynchronous request for loopback to call UcsXml_FreeVal */
   sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, 0, 0, OnStopCB, pTag);
}

/* helper function: wraps Rx message in json and triggers notification */
STATIC void NotifyEventRxMsg(uint16_t src_addr, uint16_t msg_id, uint8_t *data_ptr, uint32_t data_sz) {

    if (!eventDataRx)
        return;

    if (data_sz > CTRL_MAX_DATA_SZ) {
        AFB_NOTICE("RX-MSG: discarded, payload exceeds %d bytes", CTRL_MAX_DATA_SZ);
        return;
    }

    json_object *j_event_info = json_object_new_object();
    json_object *j_array = json_object_new_array();

    if (!j_event_info || !j_array) {
        if (j_event_info) {
            json_object_put(j_event_info);
        }
        if (j_array) {
            json_object_put(j_array);
        }
        AFB_ERROR("Failed to create json objects");
        return;
    }

    uint32_t cnt = 0U;
    for (cnt = 0U; cnt < data_sz; cnt++) {
        json_object_array_add(j_array, json_object_new_int(data_ptr[cnt]));
    }

    json_object_object_add(j_event_info, "node", json_object_new_int(src_addr));
    json_object_object_add(j_event_info, "msgid", json_object_new_int(msg_id));
    json_object_object_add(j_event_info, "data", j_array);

    afb_event_push(eventDataRx->rx_event, j_event_info);
}

/** Asynchronous processing of Rx messages in mainloop is recommended */
STATIC int OnAmsMessageReceivedCB (sd_event_source *source, void *pTag) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;
    uint32_t data_sz = 0U;
    uint8_t *data_ptr = NULL;
    uint16_t msg_id = 0U;
    uint16_t src_addr = 0U;

    while (UCSI_GetAmsMessage(&ucsContext->ucsiData, &msg_id, &src_addr, &data_ptr, &data_sz)) {
        NotifyEventRxMsg(src_addr, msg_id, data_ptr, data_sz);
        AFB_DEBUG("RX-MSG: src=0x%04X, msg_id=0x%04X, size=%d", src_addr, msg_id, data_sz);
        UCSI_ReleaseAmsMessage(&ucsContext->ucsiData);
    }

    return 0;
}

/** This callback will be raised, when ever an applicative message on the control channel arrived */
void UCSI_CB_OnAmsMessageReceived(void *pTag)
{
    static sd_event_source *src_ptr = NULL;

    if (!src_ptr)
    {
        /* first time usage: create and trigger event source */
        sd_event_add_defer(afb_daemon_get_event_loop(), &src_ptr, &OnAmsMessageReceivedCB, pTag);
    }
    else
    {
        sd_event_source_set_enabled(src_ptr, SD_EVENT_ONESHOT);
    }
}

void UCSI_CB_OnRouteResult(void *pTag, uint16_t routeId, bool isActive, uint16_t connectionLabel)
{
    AFB_NOTICE ("Route 0x%X is active=%d, connection label=0x%X", routeId, isActive, connectionLabel);
}

void UCSI_CB_OnGpioStateChange(void *pTag, uint16_t nodeAddress, uint8_t gpioPinId, bool isHighState)
{
    AFB_NOTICE ("GPIO state of node 0x%X changed, pin=%d isHigh=%d", nodeAddress, gpioPinId, isHighState);
}

PUBLIC void UCSI_CB_OnMgrReport(void *pTag, Ucs_MgrReport_t code, uint16_t nodeAddress, Ucs_Rm_Node_t *pNode){

    bool available;

    if (code == UCS_MGR_REP_AVAILABLE) {
        available = true;
    }
    else if (code == UCS_MGR_REP_NOT_AVAILABLE) {
        available = false;
    }
    else {
        /*untracked event - just exit*/
        return;
    }

    if (eventData) {

        json_object *j_event_info = json_object_new_object();
        json_object_object_add(j_event_info, "node", json_object_new_int(nodeAddress));
        json_object_object_add(j_event_info, "available", json_object_new_boolean(available));

        afb_event_push(eventData->node_event, j_event_info);
    }
}

bool Cdev_Init(CdevData_t *d, const char *fileName, bool read, bool write)
{
    if (NULL == d || NULL == fileName)  goto OnErrorExit;

    memset(d, 0, sizeof(CdevData_t));
    strncpy(d->fileName, fileName, MAX_FILENAME_LEN);
    d->fileHandle = -1;

    if (read && write)
        d->fileFlags = O_RDWR | O_NONBLOCK;
    else if (read)
        d->fileFlags = O_RDONLY | O_NONBLOCK;
    else if (write)
        d->fileFlags = O_WRONLY | O_NONBLOCK;

    /* open file to enable event loop */
    d->fileHandle = open(d->fileName, d->fileFlags);
    if (d->fileHandle  <= 0) goto OnErrorExit;

    return true;

 OnErrorExit:
    return false;
}

static bool InitializeCdevs(ucsContextT *ucsContext)
{
    if(!Cdev_Init(&ucsContext->tx, CONTROL_CDEV_TX, false, true))
        return false;
    if(!Cdev_Init(&ucsContext->rx, CONTROL_CDEV_RX, true, false))
        return false;
    return true;
}

/* Callback fire when something is avaliable on MOST cdev */
int onReadCB (sd_event_source* src, int fileFd, uint32_t revents, void* pTag) {
    ucsContextT *ucsContext =( ucsContextT*) pTag;
    ssize_t len;
    uint8_t pBuffer[RX_BUFFER];
    int ok;

    len = read (ucsContext->rx.fileHandle, &pBuffer, sizeof(pBuffer));
    if (0 == len)
        return 0;
    ok= UCSI_ProcessRxData(&ucsContext->ucsiData, pBuffer, (uint16_t)len);
    if (!ok) {
        AFB_DEBUG ("Buffer overrun (not handle)");
        /* Buffer overrun could replay pBuffer */
    }
    return 0;
}


STATIC char* GetDefaultConfig(void) {

    char const *data_path = getenv("AFM_APP_INSTALL_DIR");

    if (!data_path) {
        AFB_ERROR("AFM_APP_INSTALL_DIR is not defined");
    }
    else {
        size_t size;
        char * config_path;

        AFB_NOTICE("AFM_APP_INSTALL_DIR is: %s", data_path);
        size = strlen(data_path) + strlen(XML_CONFIG_FOLDER) + strlen(XML_CONFIG_FILE) + 2;
        config_path = malloc(size);
        if (config_path != NULL) {
            snprintf(config_path, size, "%s%s%s", data_path, XML_CONFIG_FOLDER, XML_CONFIG_FILE);
            if(access(config_path, R_OK ) == 0) {
                AFB_NOTICE("Default configuration: %s", config_path);
                return config_path;
            }
        }
    }

    return NULL;
}

STATIC UcsXmlVal_t* ParseFile(const char *filename) {
    char *xmlBuffer;
    ssize_t readSize;
    int fdHandle ;
    struct stat fdStat;
    UcsXmlVal_t *ucsConfig = NULL;

    fdHandle = open(filename, O_RDONLY);
    if (fdHandle <= 0) {
        AFB_ERROR("File not accessible: '%s' err=%s", filename, strerror(fdHandle));
        goto OnErrorExit;
    }

    /* read file into buffer as a \0 terminated string */
    fstat(fdHandle, &fdStat);
    xmlBuffer = (char*)alloca(fdStat.st_size + 1);
    readSize = read(fdHandle, xmlBuffer, fdStat.st_size);
    close(fdHandle);
    xmlBuffer[readSize] = '\0'; /* In any case, terminate it. */

    if (readSize != fdStat.st_size)  {
        AFB_ERROR("File to read fullfile '%s' size(%d!=%d)", filename, (int)readSize, (int)fdStat.st_size);
        goto OnErrorExit;
    }

    ucsConfig = UcsXml_Parse(xmlBuffer);
    if (!ucsConfig)  {
        AFB_ERROR("File XML invalid: '%s'", filename);
        goto OnErrorExit;
    }
    AFB_NOTICE ("Parsing result: %d Nodes, %d Scripts, Ethernet Bandwith %d bytes = %.2f MBit/s", ucsConfig->nodSize, ucsConfig->routesSize, ucsConfig->packetBw, (48 * 8 * ucsConfig->packetBw / 1000.0));

    return (ucsConfig);

 OnErrorExit:
    return NULL;
}

PUBLIC int StartConfiguration(const char *filename) {
    static ucsContextT ucsContext = { 0 };

    sd_event_source *evtSource;
    int err;

    /* Read and parse XML file */
    ucsContext.ucsConfig = ParseFile(filename);
    if (NULL == ucsContext.ucsConfig) {
        AFB_ERROR ("Cannot access or load file: '%s'", filename);
        goto OnErrorExit;
    }

    /* When ucsContextS is set, do not initalize UNICENS, CDEVs or system hooks, just load new XML */
    if (!ucsContextS)
    {
        if (!ucsContextS && !InitializeCdevs(&ucsContext))  {
            AFB_ERROR ("Fail to initialise device [rx=%s tx=%s]", CONTROL_CDEV_RX, CONTROL_CDEV_TX);
            goto OnErrorExit;
        }

        /* Initialise UNICENS Config Data Structure */
        UCSI_Init(&ucsContext.ucsiData, &ucsContext);

        /* register aplayHandle file fd into binder mainloop */
        err = sd_event_add_io(afb_daemon_get_event_loop(), &evtSource, ucsContext.rx.fileHandle, EPOLLIN, onReadCB, &ucsContext);
        if (err < 0) {
            AFB_ERROR ("Cannot hook events to mainloop");
            goto OnErrorExit;
        }

        /* save this in a statical variable until ucs2vol move to C */
        ucsContextS = &ucsContext;
    }
    /* Initialise UNICENS with parsed config */
    if (!UCSI_NewConfig(&ucsContext.ucsiData, ucsContext.ucsConfig))   {
        AFB_ERROR ("Fail to initialize UNICENS");
        goto OnErrorExit;
    }

    return 0;

 OnErrorExit:
    return -1;
}

PUBLIC void ucs2_initialise (struct afb_req request) {
    const char *filename = afb_req_value(request, "filename");

    if (!filename) {
        afb_req_fail_f (request, "filename-missing", "No filename given");
        goto OnErrorExit;
    }

    if (StartConfiguration(filename) != 0) {
        afb_req_fail_f (request, "load-failed", "Cannot parse file and start UNICENS");
        goto OnErrorExit;
    }

    afb_req_success(request,NULL,"UNICENS-active");

 OnErrorExit:
    return;
}


// List Avaliable Configuration Files
PUBLIC void ucs2_listconfig (struct afb_req request) {
    struct json_object *queryJ, *tmpJ, *responseJ;
    DIR  *dirHandle;
    char *dirPath, *dirList;
    int error=0;

    queryJ = afb_req_json(request);
    if (queryJ && json_object_object_get_ex (queryJ, "cfgpath" , &tmpJ)) {
        dirList = strdup (json_object_get_string(tmpJ));
    } else {
        dirList = strdup (UCS2_CFG_PATH);
        AFB_NOTICE ("fgpath:missing uses UCS2_CFG_PATH=%s", UCS2_CFG_PATH);
    }

    responseJ = json_object_new_array();
    for (dirPath= strtok(dirList, ":"); dirPath && *dirPath; dirPath=strtok(NULL,":")) {
         struct dirent *dirEnt;

        dirHandle = opendir (dirPath);
        if (!dirHandle) {
            AFB_NOTICE ("ucs2_listconfig dir=%s not readable", dirPath);
            error++;
            continue;
        }

        AFB_NOTICE ("ucs2_listconfig scanning: %s", dirPath);
        while ((dirEnt = readdir(dirHandle)) != NULL) {
            // Unknown type is accepted to support dump filesystems
            if (dirEnt->d_type == DT_REG || dirEnt->d_type == DT_UNKNOWN) {
                struct json_object *pathJ = json_object_new_object();
                json_object_object_add(pathJ, "dirpath", json_object_new_string(dirPath));
                json_object_object_add(pathJ, "basename", json_object_new_string(dirEnt->d_name));
                json_object_array_add(responseJ, pathJ);
            }
        }
    }

    free (dirList);

    if (!error)  afb_req_success(request,responseJ,NULL);
    else {
        char info[40];
        snprintf (info, sizeof(info), "[%d] where not scanned", error);
         afb_req_success(request,responseJ, info);
    }

    return;
}

PUBLIC void ucs2_subscribe (struct afb_req request) {

    if (!eventData) {

        eventData = malloc(sizeof(EventData_t));
        if (eventData) {
            eventData->node_event = afb_daemon_make_event ("node-availibility");
        }

        if (!eventData || !afb_event_is_valid(eventData->node_event)) {
            afb_req_fail_f (request, "create-event", "Cannot create or register event");
            goto OnExitError;
        }
    }

    if (afb_req_subscribe(request, eventData->node_event) != 0) {

        afb_req_fail_f (request, "subscribe-event", "Cannot subscribe to event");
        goto OnExitError;
    }

    afb_req_success(request,NULL,"event subscription successful");

OnExitError:
    return;
}

PUBLIC void ucs2_subscriberx (struct afb_req request) {

    if (!eventDataRx) {

        eventDataRx = malloc(sizeof(EventDataRx_t));
        if (eventDataRx) {
            eventDataRx->rx_event = afb_daemon_make_event("rx-message");
        }

        if (!eventDataRx || !afb_event_is_valid(eventDataRx->rx_event)) {
            afb_req_fail_f(request, "create-event", "Cannot create or register event");
            goto OnExitError;
        }
    }

    if (afb_req_subscribe(request, eventDataRx->rx_event) != 0) {

        afb_req_fail_f (request, "subscribe-event", "Cannot subscribe to event");
        goto OnExitError;
    }

    afb_req_success(request,NULL,"event subscription successful");

OnExitError:
    return;
}

static json_object * ucs2_validate_command (struct afb_req request,
        const char* func_name) {

    struct json_object *j_obj = NULL;

    if (!ucsContextS) {                     /* check UNICENS is initialized */
        afb_req_fail_f(request, "unicens-init",
                "Load a configuration before calling %s.",
                func_name);
        goto OnErrorExit;
    }

    j_obj = afb_req_json(request);
    if (!j_obj) {
        afb_req_fail_f(request,
                "query-notjson","query=%s not a valid json entry",
                afb_req_value(request,""));
        goto OnErrorExit;
    }

    AFB_DEBUG("request: %s", json_object_to_json_string(j_obj));

    if (json_object_get_type(j_obj)==json_type_array) {
        int len = json_object_array_length(j_obj);

        if (len == 1) {             /* only support 1 command in array */
            j_obj = json_object_array_get_idx(j_obj, 0);
        }
        else {
            afb_req_fail_f(request,
                    "query-array",
                    "query of multiple %s commands is not supported",
                    func_name);
            j_obj = NULL;
            goto OnErrorExit;
        }
    }

 OnErrorExit:
    return j_obj;
}

STATIC void ucs2_writei2c_CB (void *result_ptr, void *request_ptr) {

    if (request_ptr){
        afb_req *req = (afb_req *)request_ptr;
        Ucs_I2c_ResultCode_t *res = (Ucs_I2c_ResultCode_t *)result_ptr;

        if (!res) {
            afb_req_fail(*req, "processing","busy or lost initialization");
        }
        else if (*res != UCS_I2C_RES_SUCCESS){
            afb_req_fail_f(*req, "error-result", "result code: %d", *res);
        }
        else {
            afb_req_success(*req, NULL, "success");
        }

        afb_req_unref(*req);
        free(request_ptr);
    }
    else {
        AFB_NOTICE("write_i2c: ambiguous response data");
    }
}

/* write a single i2c command */
STATIC void ucs2_writei2c_cmd(struct afb_req request, json_object *j_obj) {

    static uint8_t i2c_data[I2C_MAX_DATA_SZ];
    uint8_t i2c_data_sz = 0;
    uint16_t node_addr = 0;
    struct afb_req *async_req_ptr = NULL;
    json_object *j_tmp;
    json_bool key_found;

    if (json_object_object_get_ex(j_obj, "node", &j_tmp)) {
        node_addr = (uint16_t)json_object_get_int(j_tmp);
        AFB_NOTICE("node_address: 0x%02X", node_addr);
        if (node_addr == 0) {
            afb_req_fail_f(request, "query-params","param node invalid type");
            goto OnErrorExit;
        }
    }
    else {
        afb_req_fail_f(request, "query-params","param node missing");
        goto OnErrorExit;
    }

    key_found = json_object_object_get_ex(j_obj, "data", &j_tmp);
    if (key_found && (json_object_get_type(j_tmp)==json_type_array)) {
        int size = json_object_array_length(j_tmp);
        if ((size > 0) && (size <= I2C_MAX_DATA_SZ)) {

            int32_t i;
            int32_t val;
            struct json_object *j_elem;

            for (i = 0; i < size; i++) {

                j_elem = json_object_array_get_idx(j_tmp, i);
                val = json_object_get_int(j_elem);
                if ((val < 0) && (val > 0xFF)){
                    i = 0;
                    break;
                }
                i2c_data[i] = (uint8_t)json_object_get_int(j_elem);
            }

            i2c_data_sz = (uint8_t)i;
        }
    }

    if (i2c_data_sz == 0) {
        AFB_NOTICE("data: invalid or not found");
        afb_req_fail_f(request, "query-params","params wrong or missing");
        goto OnErrorExit;
    }

    async_req_ptr = malloc(sizeof(afb_req));
    *async_req_ptr = request;

    if (UCSI_I2CWrite(  &ucsContextS->ucsiData,   /* UCSI_Data_t *pPriv*/
                        node_addr,                /* uint16_t targetAddress*/
                        false,                    /* bool isBurst*/
                        0u,                       /* block count */
                        0x2Au,                    /* i2c slave address */
                        0x03E8u,                  /* timeout 1000 milliseconds */
                        i2c_data_sz,              /* uint8_t dataLen */
                        &i2c_data[0],             /* uint8_t *pData */
                        &ucs2_writei2c_CB,        /* callback*/
                        (void*)async_req_ptr      /* callback argument */
                  )) {
        /* asynchronous command is running */
        afb_req_addref(request);
    }
    else {
        AFB_NOTICE("i2c write: scheduling command failed");
        afb_req_fail_f(request, "query-command-queue","command queue overload");
        free(async_req_ptr);
        async_req_ptr = NULL;
        goto OnErrorExit;
    }

OnErrorExit:
    return;
}

/* parse array or single command */
PUBLIC void ucs2_writei2c (struct afb_req request) {

    struct json_object *j_obj;

    j_obj = ucs2_validate_command(request, "writei2c");

    if (j_obj) {
        ucs2_writei2c_cmd(request, j_obj);
    }
}

/* write a single control message */
STATIC void ucs2_sendmessage_cmd(struct afb_req request, json_object *j_obj) {

    static uint8_t ctrl_data[CTRL_MAX_DATA_SZ];
    uint8_t ctrl_data_sz = 0;
    uint16_t node_addr = 0;
    uint16_t msg_id = 0;
    json_object *j_tmp;

    if (json_object_object_get_ex(j_obj, "node", &j_tmp)) {
        node_addr = (uint16_t)json_object_get_int(j_tmp);
        AFB_NOTICE("node_address: 0x%02X", node_addr);
        if (node_addr == 0) {
            afb_req_fail_f(request, "query-params","param node invalid type");
            goto OnErrorExit;
        }
    }
    else {
        afb_req_fail_f(request, "query-params","param node missing");
        goto OnErrorExit;
    }

    if (json_object_object_get_ex(j_obj, "msgid", &j_tmp)) {
        if (json_object_get_type(j_tmp) == json_type_int) {
            msg_id = (uint16_t)json_object_get_int(j_tmp);
            AFB_NOTICE("msgid: 0x%02X", msg_id);
        }
        else {
            afb_req_fail_f(request, "query-params","param msgid invalid type");
            goto OnErrorExit;
        }
    }
    else {
        afb_req_fail_f(request, "query-params","param msgid missing");
        goto OnErrorExit;
    }

    if (json_object_object_get_ex(j_obj, "data", &j_tmp)) {
        if (json_object_get_type(j_tmp)==json_type_array) {
            int size = json_object_array_length(j_tmp);
            if ((size > 0) && (size <= CTRL_MAX_DATA_SZ)) {
                int32_t i;
                int32_t val;
                struct json_object *j_elem;

                for (i = 0; i < size; i++) {
                    j_elem = json_object_array_get_idx(j_tmp, i);
                    val = json_object_get_int(j_elem);
                    if ((val < 0) && (val > 0xFF)){
                        i = 0;
                        break;
                    }
                    ctrl_data[i] = (uint8_t)json_object_get_int(j_elem);
                }

                if (i != size) {    /* check if size matches */
                    afb_req_fail_f(request, "query-params",
                            "parameter data is ambiguous");
                    goto OnErrorExit;
                }

                ctrl_data_sz = (uint8_t)i;
            }
        }
    }

    if (UCSI_SendAmsMessage(&ucsContextS->ucsiData,   /* UCSI_Data_t *pPriv*/
            msg_id,
            node_addr,
            &ctrl_data[0],
            ctrl_data_sz)) {
        afb_req_success(request, NULL, "sendmessage started successful");
    }
    else {
        AFB_NOTICE("sendmessage: scheduling command failed");
        afb_req_fail_f(request, "query-command-queue","command queue overload");
        goto OnErrorExit;
    }

OnErrorExit:
    return;
}

PUBLIC void ucs2_sendmessage(struct afb_req request) {
    struct json_object *j_obj;

    j_obj = ucs2_validate_command(request, "sendmessage");

    if (j_obj) {
        ucs2_sendmessage_cmd(request, j_obj);
    }
}

PUBLIC void ucs2_sendmessageb64(struct afb_req req) {
    afb_req_fail_f(req, "not-implemented", "Function not yet implemented.");
}

PUBLIC int ucs2_initbinding(void) {
#ifndef DISABLE_AUTOSTART
    char *filename = GetDefaultConfig();
    if (filename != NULL) {

        AFB_NOTICE("AUTO-LOAD configuration: %s", filename);
        if (StartConfiguration(filename) == 0) {
            AFB_NOTICE("AUTO-LOAD successful");
        } else {
            AFB_NOTICE("AUTO-LOAD failed");
        }
        free(filename);
    }
#endif
    return 0;
}