nabto_client_connection_set_server_key()

DESCRIPTION

Set the server key, which is provided by Nabto. Each APP needs its own server key to be able to connect to the Nabto server. The server key is used to distinguish different apps. Since the server key will be put into the final applications it’s not secret.

DECLARATION

NABTO_CLIENT_DECL_PREFIX NabtoClientError NABTO_CLIENT_API
nabto_client_connection_set_server_key(NabtoClientConnection* connection,
                                       const char* serverKey)

PARAMETERS

connection:
The connection
serverKey:
The server key

RETURN VALUES

NABTO_CLIENT_EC_OK on success NABTO_CLIENT_EC_INVALID_STATE if the connection is not in the setup phase

EXAMPLES

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>

#include <nabto/nabto_client.h>

struct ClientContext {
    NabtoClient* client;
    NabtoClientConnection* connection;
    NabtoClientFuture* future;
};

static void connect();
static void cb_connected(NabtoClientFuture *future, NabtoClientError ec, void *data);
static void print_connection_info(struct ClientContext* ctx);
static void print_connection_type(struct ClientContext* ctx);
static void cleanup(struct ClientContext* ctx);

static int finished = 0;

int main(int argc, char** argv) {
    struct ClientContext* ctx = (struct ClientContext*)malloc(sizeof(struct ClientContext));
    memset(ctx, 0, sizeof(struct ClientContext));
    ctx->client = nabto_client_new();
    connect(ctx);
    while (!finished) {
        // do stuff here while the connect future asynchonously resolves - or use
        // nabto_client_future_wait for synchronous behavior instead of setting async callback
        sleep(1);
        print_connection_type(ctx);
    }
    nabto_client_free(ctx->client);
    return 0;
}

static void connect(struct ClientContext* ctx) {
    const char* clientPrivateKey =
        "-----BEGIN EC PARAMETERS-----"
        "BggqhkjOPQMBBw=="
        "-----END EC PARAMETERS-----"
        "-----BEGIN EC PRIVATE KEY-----"
        "MHcCAQEEIPzp7QHuqMZLXMmigdEtUsJ/sgE0IKRONnAHhmB1/OBdoAoGCCqGSM49"
        "AwEHoUQDQgAEHOb4U+Jervfn/cSe+zg7SdhdFbxVkYWZU35dsycrGYhsOcD8jyYI"
        "gvjMfjwJ6wNV3aFXyWdPdfY/brfP/dyjUw=="
        "-----END EC PRIVATE KEY-----";
    ctx->connection = nabto_client_connection_new(ctx->client);

    nabto_client_connection_set_private_key(ctx->connection, clientPrivateKey);
    nabto_client_connection_set_product_id(ctx->connection, "pr-xruwhj1");
    nabto_client_connection_set_device_id(ctx->connection, "de-1cgtwfm3");
    nabto_client_connection_set_server_url(ctx->connection, "https://pr-xruwhj1.clients.nabto.net");
    nabto_client_connection_set_server_key(ctx->connection, "sk-33c11dece0517aaa1837b5e49fe1bdd1");
    nabto_client_connection_set_application_name(ctx->connection, "DemoApp");
    nabto_client_connection_set_application_version(ctx->connection, "1.0.0");

    ctx->future = nabto_client_future_new(ctx->client);
    nabto_client_connection_connect(ctx->connection, ctx->future);
    nabto_client_future_set_callback(ctx->future, cb_connected, ctx);
}

static void cb_connected(NabtoClientFuture *future, NabtoClientError ec, void *data) {
    struct ClientContext* ctx = (struct ClientContext*)data;
    if (ec == NABTO_CLIENT_EC_OK) {
        printf("Connection attempt succeeded.\n");
        print_connection_info(ctx);
        print_connection_type(ctx);
        // TODO: use connection - for instance, open a stream or send a CoAP request, close connection when done
    } else {
        printf("Connection attempt failed, ec=%d.\n", ec);
        print_connection_info(ctx);
        cleanup(ctx);
    }
}

static void print_connection_info(struct ClientContext* ctx) {
    char* json;
    if (!ctx->connection) {
        return;
    }
    if (nabto_client_connection_get_options(ctx->connection, &json) == NABTO_CLIENT_EC_OK) {
        printf("Connection options: %s\n", json);
        nabto_client_string_free(json);
    } else {
        printf("Could not get connection options.\n");
    }
    if (nabto_client_connection_get_info(ctx->connection, &json) == NABTO_CLIENT_EC_OK) {
        printf("Connection info: %s\n", json);
        nabto_client_string_free(json);
    } else {
        printf("Could not get connection info.\n");
    }
}

static void print_connection_type(struct ClientContext* ctx) {
    if (!ctx->connection) {
        return;
    }
    NabtoClientConnectionType type;
    NabtoClientError ec = nabto_client_connection_get_type(ctx->connection, &type);
    const char* typeStr;
    if (ec == NABTO_CLIENT_EC_OK) {
        switch (type) {
        case NABTO_CLIENT_CONNECTION_TYPE_RELAY: typeStr = "RELAY"; break;
        case NABTO_CLIENT_CONNECTION_TYPE_DIRECT: typeStr = "DIRECT"; break;
        default: assert(!"Unexpected connection type");
        }
    } else {
        typeStr = "not determined";
    }
    printf("Connection type is currently %s\n", typeStr);
}

static void cleanup(struct ClientContext* ctx) {
    if (ctx->connection) {
        nabto_client_connection_close(ctx->connection, ctx->future);
        if (ctx->future) {
            nabto_client_future_wait(ctx->future);
        }
        nabto_client_connection_free(ctx->connection);
        ctx->connection = NULL;
    }
    if (ctx->future) {
        nabto_client_future_free(ctx->future);
        ctx->future = NULL;
    }
    finished = 1;
}