From 5454acdb6e04aa454989b78a2f20be2c25740585 Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Wed, 4 Dec 2019 06:13:26 +0100
Subject: esp32: added sock interface

---
 code/esp32/components/eos/include/sock.h |  18 ++++
 code/esp32/components/eos/sock.c         | 155 +++++++++++++++++++++++++++++++
 2 files changed, 173 insertions(+)
 create mode 100644 code/esp32/components/eos/include/sock.h
 create mode 100644 code/esp32/components/eos/sock.c

(limited to 'code')

diff --git a/code/esp32/components/eos/include/sock.h b/code/esp32/components/eos/include/sock.h
new file mode 100644
index 0000000..7e937cb
--- /dev/null
+++ b/code/esp32/components/eos/include/sock.h
@@ -0,0 +1,18 @@
+#include <stdint.h>
+
+#define EOS_SOCK_MTYPE_PKT          0
+#define EOS_SOCK_MTYPE_OPEN_DGRAM   1
+#define EOS_SOCK_MTYPE_CLOSE        127
+
+#define EOS_SOCK_MAX_SOCK           2
+
+#define EOS_SOCK_SIZE_UDP_HDR       8
+
+#define EOS_IPv4_ADDR_SIZE          4
+
+typedef struct EOSNetAddr {
+    unsigned char host[EOS_IPv4_ADDR_SIZE];
+    uint16_t port;
+} EOSNetAddr;
+
+void eos_sock_init(void);
\ No newline at end of file
diff --git a/code/esp32/components/eos/sock.c b/code/esp32/components/eos/sock.c
new file mode 100644
index 0000000..2ccfb65
--- /dev/null
+++ b/code/esp32/components/eos/sock.c
@@ -0,0 +1,155 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/semphr.h>
+
+#include <esp_system.h>
+#include <esp_event.h>
+#include <esp_event_loop.h>
+#include <esp_log.h>
+#include <esp_err.h>
+#include <esp_wifi.h>
+#include <nvs_flash.h>
+
+#include <lwip/sockets.h>
+#include <lwip/err.h>
+#include <lwip/sockets.h>
+#include <lwip/sys.h>
+#include <lwip/netdb.h>
+#include <lwip/dns.h>
+
+#include "eos.h"
+#include "net.h"
+#include "sock.h"
+
+static const char *TAG = "EOS";
+static SemaphoreHandle_t mutex;
+static int _socks[EOS_SOCK_MAX_SOCK];
+
+static int t_open_dgram(void) {
+    struct sockaddr_in _myaddr;
+    int sock;
+
+    sock = socket(PF_INET, SOCK_DGRAM, 0);
+    if (sock < 0) return sock;
+
+    memset((char *)&_myaddr, 0, sizeof(_myaddr));
+    _myaddr.sin_family = AF_INET;
+    _myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+    _myaddr.sin_port = htons(3000);
+
+    int rv = bind(sock, (struct sockaddr *)&_myaddr, sizeof(_myaddr));
+    if (rv < 0) {
+        close(sock);
+        return rv;
+    }
+    return sock;
+}
+
+static void t_close(int sock) {
+    close(sock);
+}
+
+static ssize_t t_sendto(int sock, void *msg, size_t msg_size, EOSNetAddr *addr) {
+    struct sockaddr_in servaddr;
+
+    memset((void *)&servaddr, 0, sizeof(servaddr));
+    servaddr.sin_family = AF_INET;
+    servaddr.sin_port = addr->port;
+    memcpy((void *)&servaddr.sin_addr, addr->host, sizeof(addr->host));
+    return sendto(sock, msg, msg_size, 0, (struct sockaddr *)&servaddr, sizeof(servaddr));
+}
+
+static ssize_t t_recvfrom(int sock, void *msg, size_t msg_size, EOSNetAddr *addr) {
+    struct sockaddr_in servaddr;
+    socklen_t addrlen = sizeof(servaddr);
+    memset((void *)&servaddr, 0, sizeof(servaddr));
+
+    ssize_t recvlen = recvfrom(sock, msg, msg_size, 0, (struct sockaddr *)&servaddr, &addrlen);
+    if (recvlen < 0) return recvlen;
+
+    if (addr) {
+        addr->port = servaddr.sin_port;
+        memcpy(addr->host, (void *)&servaddr.sin_addr, sizeof(addr->host));
+    }
+    return recvlen;
+}
+
+static void sock_receiver(void *pvParameters) {
+    EOSNetAddr addr;
+    unsigned char buffer[EOS_NET_SIZE_BUF];
+    uint8_t esock = (uint8_t)pvParameters;
+    int sock = _socks[esock-1];
+
+    buffer[0] = EOS_SOCK_MTYPE_PKT;
+    buffer[1] = esock;
+    do {
+        ssize_t rv = t_recvfrom(sock, buffer+EOS_SOCK_SIZE_UDP_HDR, EOS_NET_SIZE_BUF-EOS_SOCK_SIZE_UDP_HDR, &addr);
+        if (rv < 0) {
+            sock = 0;
+            ESP_LOGE(TAG, "UDP RECV ERR:%d", rv);
+            continue;
+        }
+        memcpy(buffer+2, addr.host, sizeof(addr.host));
+        memcpy(buffer+2+sizeof(addr.host), &addr.port, sizeof(addr.port));
+        eos_net_send(EOS_NET_MTYPE_SOCK, buffer, rv+EOS_SOCK_SIZE_UDP_HDR, 0);
+    } while(sock);
+    xSemaphoreTake(mutex, portMAX_DELAY);
+    _socks[esock-1] = 0;
+    xSemaphoreGive(mutex);
+    vTaskDelete(NULL);
+}
+
+static void sock_handler(unsigned char type, unsigned char *buffer, uint16_t size) {
+    EOSNetAddr addr;
+    unsigned char ret[2];
+    uint8_t esock;
+    int sock, i;
+
+    if (size < 1) return;
+
+    switch(buffer[0]) {
+        case EOS_SOCK_MTYPE_PKT:
+            if (size < EOS_SOCK_SIZE_UDP_HDR) return;
+            sock = _socks[buffer[1]-1];
+            memcpy(addr.host, buffer+2, sizeof(addr.host));
+            memcpy(&addr.port, buffer+2+sizeof(addr.host), sizeof(addr.port));
+            t_sendto(sock, buffer+EOS_SOCK_SIZE_UDP_HDR, size-EOS_SOCK_SIZE_UDP_HDR, &addr);
+            break;
+        case EOS_SOCK_MTYPE_OPEN_DGRAM:
+            sock = t_open_dgram();
+            esock = 0;
+            if (sock > 0) {
+                xSemaphoreTake(mutex, portMAX_DELAY);
+                for (i=0; i<EOS_SOCK_MAX_SOCK; i++) {
+                    if (_socks[i] == 0) {
+                        esock = i+1;
+                        _socks[i] = sock;
+                    }
+                }
+                xSemaphoreGive(mutex);
+            }
+            ret[0] = EOS_SOCK_MTYPE_OPEN_DGRAM;
+            ret[1] = esock;
+            // xTaskCreatePinnedToCore(&sock_receiver, "sock_receiver", 2048, NULL, EOS_IRQ_PRIORITY_UDP_RCVR, NULL, 1);
+            xTaskCreate(&sock_receiver, "sock_receiver", 2048, (void *)esock, EOS_IRQ_PRIORITY_UDP_RCVR, NULL);
+            eos_net_send(EOS_NET_MTYPE_SOCK, ret, 2, 0);
+            break;
+        case EOS_SOCK_MTYPE_CLOSE:
+            if (size < 2) return;
+            sock = _socks[buffer[1]-1];
+            t_close(sock);
+            break;
+        default:
+            break;
+    }
+}
+
+void eos_sock_init(void) {
+    mutex = xSemaphoreCreateBinary();
+    xSemaphoreGive(mutex);
+    eos_net_set_handler(EOS_NET_MTYPE_SOCK, sock_handler);
+}
\ No newline at end of file
-- 
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