/**
* @brief This function is used to close the tcp connection with server
*/
static void tcp_echoclient_connection_close(TM_TCPCLIENT_t* client, uint8_t success) {
/* Remove callbacks from PCB */
if (client->pcb != NULL) {
tcp_recv(client->pcb, NULL);
tcp_sent(client->pcb, NULL);
tcp_poll(client->pcb, NULL, 0);
}
/* Close tcp connection */
if (client->pcb != NULL) {
tcp_close(client->pcb);
}
/* Free pcb */
mem_free(client->pcb);
/* Increase number of connections */
TM_ETHERNET.ClientConnections++;
/* In case connection was successfull */
if (success) {
/* Increase successfull connections counter */
TM_ETHERNET.ClientSuccessfullConnections++;
}
/* Free client, it's not real free, only free flag is set */
/* Called before connection callback, so user can make a new connection */
/* inside connection closed callback */
tcp_client_free(client);
/* Call user function if defined */
TM_ETHERNETCLIENT_ConnectionClosedCallback(client, success);
}
static int tcp_client_remove(int cid) {
tcp_client* c;
c = hashtable_remove(clients, &cid);
if (c == NULL) return 0;
tcp_client_free(c);
return 1;
}
/* Connects to the TCP echo server */
err_t tcp_echoclient_connect(char* conn_name, uint8_t ip1, uint8_t ip2, uint8_t ip3, uint8_t ip4, uint16_t port, void* user_parameters) {
struct ip_addr DestIPaddr;
TM_TCPCLIENT_t* client;
/* Check if we have already active connections */
if (tcp_client_get_number_active_connections()) {
/* If cable is unplugged and we want to make a new connection */
if (CablePluggedWithActiveConnection) {
/* Call user function if he wants to reset MCU */
TM_ETHERNET_SystemResetCallback();
/* Return "error" */
return ERR_CONN;
}
}
/* Check if conection name is too big */
if (strlen(conn_name) >= ETHERNET_MAX_CONNECTION_NAME) {
return ERR_ARG;
}
/* Check for connection */
client = tcp_client_malloc();
/* In case no memory available */
if (client == NULL) {
return ERR_MEM;
}
tcp_echoclient_connection_close(client, 0);
tcp_client_free(client);
/* create new tcp pcb */
client->pcb = tcp_new();
if (client->pcb != NULL) {
/* Set IP address */
IP4_ADDR(&DestIPaddr, ip1, ip2, ip3, ip4);
/* Save IP address */
client->ip_addr[0] = ip1;
client->ip_addr[1] = ip2;
client->ip_addr[2] = ip3;
client->ip_addr[3] = ip4;
/* Save port */
client->port = port;
/* Clear flag for headers */
client->headers_done = 0;
/* Save user parameters */
client->user_parameters = user_parameters;
/* Save connection name */
strcpy(client->name, conn_name);
/* Set parameters */
tcp_arg(client->pcb, client);
/* Set error function */
tcp_err(client->pcb, tcp_echoclient_error);
/* connect to destination address/port */
tcp_connect(client->pcb, &DestIPaddr, port, tcp_echoclient_connected);
/* Connection has started */
TM_ETHERNETCLIENT_ConnectionStartedCallback(client);
/* Return OK */
return ERR_OK;
} else {
/* Deallocate */
tcp_client_free(client);
}
/* Return error */
return ERR_CONN;
}
