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#include <pico/stdio.h>
#include <lwip/opt.h>
#include <lwip/sys.h>
#include <lwip/api.h>
#include <string.h>
#include "init.h"
#include "config.h"
#include "i2ctcpv1.h"
#include "sock.h"
#include "pb-mod.h"
struct netconn* current_connection = NULL;
i2ctcp_msg_t recv_msg;
void i2c_send(uint16_t addr, const char * data, size_t data_size) {
if (current_connection == NULL) return;
i2ctcp_msg_t send_msg = {
.addr = addr,
.data = (char *) data,
.length = data_size,
};
char * buf;
size_t buf_sz;
if (!i2ctcp_write(&send_msg, &buf, &buf_sz)) return;
// NOTE: netconn does return an error code, but the data needs to be freed
// whether netconn throws an error or not, so it remains unused
netconn_write(current_connection, buf, buf_sz, NETCONN_COPY);
free(buf);
}
static void i2c_recv_fwd(uint16_t addr, const uint8_t * data, size_t data_size) {
if (addr == PB_MOD_ADDR) {
// addressed to me = act as recieved
pb_i2c_recv(data, data_size);
} else {
// addressed to other puzzle module = forward
pb_i2c_send(addr, data, data_size);
}
}
void recv_handler(struct netconn* conn, struct netbuf* buf) {
i2ctcp_read_reset(&recv_msg);
do {
char* data;
uint16_t len;
netbuf_data(buf, (void**)&data, &len);
// continue early if more data is needed to complete message
if (i2ctcp_read(&recv_msg, data, len) != 0) continue;
// forward received message to puzzle bus
i2c_recv_fwd(recv_msg.addr, (uint8_t *) recv_msg.data, recv_msg.length);
free(recv_msg.data);
} while (netbuf_next(buf) >= 0);
netbuf_delete(buf);
}
void accept_handler(struct netconn* conn) {
current_connection = conn;
struct netbuf* buf;
while (netconn_recv(conn, &buf) == ERR_OK)
recv_handler(conn, buf);
netconn_close(conn);
netconn_delete(conn);
current_connection = NULL;
}
void serve_task() {
printf("starting server...\n");
struct netconn* conn = netconn_new(NETCONN_TCP);
netconn_bind(conn, IP_ADDR_ANY, CFG_SRV_PORT);
netconn_listen(conn);
printf("listening on %s:%d\n", ip4addr_ntoa(netif_ip4_addr(netif_list)), CFG_SRV_PORT);
while (1) {
struct netconn* incoming;
if (netconn_accept(conn, &incoming) == ERR_OK)
accept_handler(incoming);
}
}
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