mirror of https://github.com/jeelabs/esp-link.git
Thorsten von Eicken
9 years ago
commit
77baa64eb5
|
Before Width: | Height: | Size: 622 B After Width: | Height: | Size: 874 B |
|
Before Width: | Height: | Size: 2.7 KiB |
@ -0,0 +1,272 @@ |
||||
// Copyright 2015 by Thorsten von Eicken, see LICENSE.txt
|
||||
|
||||
#include <esp8266.h> |
||||
#include "config.h" |
||||
#include "uart.h" |
||||
#include "serled.h" |
||||
#include "tcpclient.h" |
||||
|
||||
// max number of channels the client can open
|
||||
#define MAX_CHAN 8 |
||||
// size of tx buffer
|
||||
#define MAX_TXBUF 1024 |
||||
|
||||
enum TcpState { |
||||
TCP_idle, // unused connection
|
||||
TCP_dns, // doing gethostbyname
|
||||
TCP_conn, // connecting to remote server
|
||||
TCP_data, // connected
|
||||
}; |
||||
|
||||
// Connections
|
||||
typedef struct { |
||||
struct espconn *conn; // esp connection structure
|
||||
esp_tcp *tcp; // esp TCP parameters
|
||||
char *txBuf; // buffer to accumulate into
|
||||
char *txBufSent; // buffer held by espconn
|
||||
uint8_t txBufLen; // number of chars in txbuf
|
||||
enum TcpState state; |
||||
} TcpConn; |
||||
|
||||
#define MAX_CONN (8) |
||||
static TcpConn tcpConn[MAX_CONN]; |
||||
|
||||
// Free a connection dynamically.
|
||||
static void ICACHE_FLASH_ATTR |
||||
tcpConnFree(TcpConn* tci) { |
||||
if (tci->conn != NULL) os_free(tci->conn); |
||||
if (tci->tcp != NULL) os_free(tci->tcp); |
||||
if (tci->txBuf != NULL) os_free(tci->txBuf); |
||||
if (tci->txBufSent != NULL) os_free(tci->txBufSent); |
||||
memset(tci, 0, sizeof(TcpConn)); |
||||
} |
||||
|
||||
// DNS name resolution callback
|
||||
static void ICACHE_FLASH_ATTR |
||||
tcpClientHostnameCb(const char *name, ip_addr_t *ipaddr, void *arg) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP dns CB (%p %p)\n", arg, tci); |
||||
if (ipaddr == NULL) { |
||||
os_printf("TCP %s not found\n", name); |
||||
} else { |
||||
os_printf("TCP %s -> %d.%d.%d.%d\n", name, IP2STR(ipaddr)); |
||||
tci->tcp->remote_ip[0] = ip4_addr1(ipaddr); |
||||
tci->tcp->remote_ip[1] = ip4_addr2(ipaddr); |
||||
tci->tcp->remote_ip[2] = ip4_addr3(ipaddr); |
||||
tci->tcp->remote_ip[3] = ip4_addr4(ipaddr); |
||||
os_printf("TCP connect %d.%d.%d.%d (%p)\n", IP2STR(tci->tcp->remote_ip), tci); |
||||
if (espconn_connect(tci->conn) == ESPCONN_OK) { |
||||
tci->state = TCP_conn; |
||||
return; |
||||
} |
||||
os_printf("TCP connect failure\n"); |
||||
} |
||||
// oops
|
||||
tcpConnFree(tci); |
||||
} |
||||
|
||||
// Send the next buffer (assumes that the connection is in a state that allows it)
|
||||
static void tcpDoSend(TcpConn *tci) { |
||||
sint8 err = espconn_sent(tci->conn, (uint8*)tci->txBuf, tci->txBufLen); |
||||
if (err == ESPCONN_OK) { |
||||
// send successful
|
||||
os_printf("TCP sent (%p %p)\n", tci->conn, tci); |
||||
tci->txBufSent = tci->txBuf; |
||||
tci->txBuf = NULL; |
||||
tci->txBufLen = 0; |
||||
} else { |
||||
// send error, leave as-is and try again later...
|
||||
os_printf("TCP send err (%p %p) %d\n", tci->conn, tci, err); |
||||
} |
||||
} |
||||
|
||||
// Connected callback
|
||||
static void ICACHE_FLASH_ATTR tcpConnectCb(void *arg) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP connect CB (%p %p)\n", arg, tci); |
||||
tci->state = TCP_data; |
||||
// send any buffered data
|
||||
if (tci->txBuf != NULL && tci->txBufLen > 0) tcpDoSend(tci); |
||||
} |
||||
|
||||
// Sent callback
|
||||
static void ICACHE_FLASH_ATTR tcpSentCb(void *arg) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP sent CB (%p %p)\n", arg, tci); |
||||
if (tci->txBufSent != NULL) os_free(tci->txBufSent); |
||||
tci->txBufSent = NULL; |
||||
|
||||
if (tci->txBuf != NULL && tci->txBufLen == MAX_TXBUF) { |
||||
// next buffer is full, send it now
|
||||
tcpDoSend(tci); |
||||
} |
||||
} |
||||
|
||||
// Recv callback
|
||||
static void ICACHE_FLASH_ATTR tcpRecvCb(void *arg, char *data, uint16_t len) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP recv CB (%p %p)\n", arg, tci); |
||||
if (tci->state == TCP_data) { |
||||
uart0_tx_buffer(data, len); |
||||
} |
||||
serledFlash(50); // short blink on serial LED
|
||||
} |
||||
|
||||
// Disconnect callback
|
||||
static void ICACHE_FLASH_ATTR tcpDisconCb(void *arg) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP disconnect CB (%p %p)\n", arg, tci); |
||||
tcpConnFree(tci); |
||||
} |
||||
|
||||
// Connection reset callback
|
||||
static void ICACHE_FLASH_ATTR tcpResetCb(void *arg, sint8 err) { |
||||
struct espconn *conn = arg; |
||||
TcpConn *tci = conn->reverse; |
||||
os_printf("TCP reset CB (%p %p) err=%d\n", arg, tci, err); |
||||
tcpConnFree(tci); |
||||
} |
||||
|
||||
// Allocate a new connection dynamically and return it. Returns NULL if no
|
||||
// connection could be allocated.
|
||||
static TcpConn* ICACHE_FLASH_ATTR |
||||
tcpConnAlloc(void) { |
||||
int i; |
||||
for (i=0; i<MAX_CONN; i++) { |
||||
if (tcpConn[i].state == TCP_idle && tcpConn[i].conn == NULL) break; |
||||
} |
||||
if (i == MAX_CONN) return NULL; |
||||
|
||||
// found an empty slot, malloc and return espconn struct
|
||||
TcpConn *tci = tcpConn+i; |
||||
tci->conn = os_malloc(sizeof(struct espconn)); |
||||
if (tci->conn == NULL) goto fail; |
||||
memset(tci->conn, 0, sizeof(struct espconn)); |
||||
// malloc esp_tcp struct
|
||||
tci->tcp = os_malloc(sizeof(esp_tcp)); |
||||
if (tci->tcp == NULL) goto fail; |
||||
memset(tci->tcp, 0, sizeof(esp_tcp)); |
||||
|
||||
// common init
|
||||
tci->state = TCP_dns; |
||||
tci->conn->type = ESPCONN_TCP; |
||||
tci->conn->state = ESPCONN_NONE; |
||||
tci->conn->proto.tcp = tci->tcp; |
||||
tci->tcp->remote_port = 80; |
||||
tci->tcp->remote_ip[0] = 173; |
||||
espconn_regist_connectcb(tci->conn, tcpConnectCb); |
||||
espconn_regist_reconcb(tci->conn, tcpResetCb); |
||||
espconn_regist_sentcb(tci->conn, tcpSentCb); |
||||
espconn_regist_recvcb(tci->conn, tcpRecvCb); |
||||
espconn_regist_disconcb(tci->conn, tcpDisconCb); |
||||
tci->conn->reverse = tci; |
||||
|
||||
return tci; |
||||
|
||||
fail: |
||||
tcpConnFree(tci); |
||||
return NULL; |
||||
} |
||||
|
||||
static TcpConn *tcConn[MAX_CHAN]; |
||||
|
||||
// Perform a TCP command: parse the command and do the right thing.
|
||||
// Returns true on success.
|
||||
bool ICACHE_FLASH_ATTR |
||||
tcpClientCommand(char cmd, char *cmdBuf) { |
||||
uint8_t tcChan; |
||||
TcpConn *tci; |
||||
|
||||
switch (cmd) { |
||||
//== TCP Connect command
|
||||
case 'T': |
||||
if (*cmdBuf < '1' || *cmdBuf > ('0'+MAX_CHAN)) break; |
||||
tcChan = *cmdBuf++ - '1'; |
||||
char *hostname = cmdBuf; |
||||
char *port = hostname; |
||||
while (*port != 0 && *port != ':') port++; |
||||
if (*port != ':') break; |
||||
*port = 0; |
||||
port++; |
||||
int portInt = atoi(port); |
||||
if (portInt < 1 || portInt > 65535) break; |
||||
|
||||
// allocate a connection
|
||||
tci = tcpConnAlloc(); |
||||
if (tci == NULL) break; |
||||
tci->state = TCP_dns; |
||||
tci->tcp->remote_port = portInt; |
||||
|
||||
// start the DNS resolution
|
||||
os_printf("TCP %p resolving %s (conn=%p)\n", tci, hostname, tci->conn); |
||||
ip_addr_t ip; |
||||
err_t err = espconn_gethostbyname(tci->conn, hostname, &ip, tcpClientHostnameCb); |
||||
if (err == ESPCONN_OK) { |
||||
// dns cache hit, got the IP address, fake the callback (sigh)
|
||||
os_printf("TCP DNS hit\n"); |
||||
tcpClientHostnameCb(hostname, &ip, tci->conn); |
||||
} else if (err != ESPCONN_INPROGRESS) { |
||||
tcpConnFree(tci); |
||||
break; |
||||
} |
||||
|
||||
tcConn[tcChan] = tci; |
||||
return true; |
||||
|
||||
//== TCP Close/disconnect command
|
||||
case 'C': |
||||
if (*cmdBuf < '1' || *cmdBuf > ('0'+MAX_CHAN)) break; |
||||
tcChan = *cmdBuf++ - '1'; |
||||
tci = tcConn[tcChan]; |
||||
if (tci->state > TCP_idle) { |
||||
tci->state = TCP_idle; // hackish...
|
||||
espconn_disconnect(tci->conn); |
||||
} |
||||
break; |
||||
|
||||
} |
||||
return false; |
||||
} |
||||
|
||||
void ICACHE_FLASH_ATTR |
||||
tcpClientSendChar(uint8_t chan, char c) { |
||||
TcpConn *tci = tcConn[chan]; |
||||
if (tci->state == TCP_idle) return; |
||||
|
||||
if (tci->txBuf != NULL) { |
||||
// we have a buffer
|
||||
if (tci->txBufLen < MAX_TXBUF) { |
||||
// buffer has space, add char and return
|
||||
tci->txBuf[tci->txBufLen++] = c; |
||||
return; |
||||
} else if (tci->txBufSent == NULL) { |
||||
// we don't have a send pending, send full buffer off
|
||||
tcpDoSend(tci); |
||||
if (tci->txBuf != NULL) return; // something went wrong
|
||||
} else { |
||||
// buffers all backed-up, drop char
|
||||
return; |
||||
} |
||||
} |
||||
// we do not have a buffer (either didn't have one or sent it off)
|
||||
// allocate one
|
||||
tci->txBuf = os_malloc(MAX_TXBUF); |
||||
tci->txBufLen = 0; |
||||
if (tci->txBuf != NULL) { |
||||
tci->txBuf[tci->txBufLen++] = c; |
||||
} |
||||
} |
||||
|
||||
void ICACHE_FLASH_ATTR |
||||
tcpClientSendPush(uint8_t chan) { |
||||
TcpConn *tci = tcConn[chan]; |
||||
if (tci->state == TCP_idle) return; // no active connection on this channel
|
||||
if (tci->txBuf == NULL || tci->txBufLen == 0) return; // no chars accumulated to send
|
||||
if (tci->txBufSent != NULL) return; // already got a send in progress
|
||||
tcpDoSend(tci); |
||||
} |
||||
@ -0,0 +1,8 @@ |
||||
#ifndef __TCP_CLIENT_H__ |
||||
#define __TCP_CLIENT_H__ |
||||
|
||||
bool tcpClientCommand(char cmd, char *cmdBuf); |
||||
void tcpClientSendChar(uint8_t chan, char c); |
||||
void tcpClientSendPush(uint8_t chan); |
||||
|
||||
#endif /* __TCP_CLIENT_H__ */ |
||||
Loading…
Reference in new issue