example_user.c

#include <string.h>

#include "UID_message.h"

int parse_result(uint8_t *buffer, size_t size, UID_ClientChannelCtx *ctx, char *res, size_t rsize, int64_t id)
{
    BTC_Address sender;
    int error = 0;
    int64_t sID;

    int ret = UID_parseRespMsg(buffer, size, sender, sizeof(sender), &error, res, rsize, &sID);
    if ( ret ) return ret;
    if (error) return UID_MSG_RPC_ERROR | error;
    if (strcmp(sender, ctx->contract.serviceProviderAddress)) return UID_MSG_INVALID_SENDER;
    if (sID != id) return UID_MSG_ID_MISMATCH;
    return 0;
}

void RPC_request(void)
{
    int ret;
    int method = 31;

    // create the contest for the communication (contract, identities of the peers, etc)
    UID_ClientChannelCtx ctx;
    if ( UID_MSG_OK != (ret = UID_createChannel("Machine name", &ctx)) ) {

//			< manage_error(ret) >

        return;
    }

    // format the message
    uint8_t buffer[1024];
    size_t size = sizeof(buffer);
    int64_t id;
    if ( UID_MSG_OK != (ret = UID_formatReqMsg(&ctx.contract.path, method, "parameter to the method", buffer, &size, &id)) ) {

//			< manage_error(ret) >

        return;
    }

//		< Send_Msg_to_provider(buffer, size) >

    uint8_t msg[1024] = {0};
    size = sizeof(msg);

//		< Wait_for_Msg_from_provider(msg, &size) >

    // parse the received message
    char result[1024] = "";
    if ( UID_MSG_OK != (ret = parse_result(msg, size, &ctx, result, sizeof(result), id))) {

//			< manage_error(ret) >

        return;
    }

//  now you have the <result> from the execution on the provider
//  of the requested method: you can use it as you need

    // close the channel
    UID_closeChannel(&ctx);
}