From 68f33af73d67785a2c6ecba6859d65145bc6ee95 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Mon, 30 Dec 2024 12:41:33 +0000
Subject: Development over Christmas.

---
 dload.c | 16 ++++++++++---
 wifi.c  | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 wifi.h  | 10 +++++---
 3 files changed, 94 insertions(+), 17 deletions(-)

diff --git a/dload.c b/dload.c
index 9431ea3..ae78e87 100644
--- a/dload.c
+++ b/dload.c
@@ -87,6 +87,12 @@ static const char *StatusCode(WifiStatus status)
         case eWifiInvalidURL:
             return "Invalid URL";
 
+        case eWifiFailedToSendCommand:
+            return "Failed to send command to modem";
+
+        case eWifiBadHTTPStatusCode:
+            return "Bad HTTP status code";
+
         case eWifiOK:
             return "OK";
 
@@ -108,13 +114,17 @@ int main(int argc, char *argv[])
         return EXIT_FAILURE;
     }
 
-    /*
     if ((status = WifiConnect()) != eWifiOK)
     {
-        fprintf(stderr, "%s\n", StatusCode(status));
+        fprintf(stderr, "WifiConnect: %s\n", StatusCode(status));
+        return EXIT_FAILURE;
+    }
+
+    if ((status = ConnectURL(0, argv[1], 0)) != eWifiOK)
+    {
+        fprintf(stderr, "ConnectURL: %s\n", StatusCode(status));
         return EXIT_FAILURE;
     }
-    */
 
     return EXIT_SUCCESS;
 }
diff --git a/wifi.c b/wifi.c
index 55453f9..1891359 100644
--- a/wifi.c
+++ b/wifi.c
@@ -36,11 +36,6 @@
 
 /* ---------------------------------------- PRIVATE ROUTINES
 */
-static WifiStatus ConnectToModem(void)
-{
-    return eWifiTimeout;
-}
-
 static WifiStatus SendToModem(const char *buffer, size_t len)
 {
     while(len)
@@ -59,6 +54,11 @@ static WifiStatus SendToModem(const char *buffer, size_t len)
     return eWifiOK;
 }
 
+static WifiStatus ConnectToModem(void)
+{
+    return eWifiTimeout;
+}
+
 static void Copy(const char *from, const char *to, char *buff, size_t maxlen)
 {
     while(maxlen && ((to && from != to) || (!to && *from)))
@@ -142,9 +142,67 @@ static int ParseURL(const char *url,
         strcpy(path, "/");
     }
 
+    if (!hostname[0])
+    {
+        return 0;
+    }
+
     return 1;
 }
 
+static void Chomp(char *p)
+{
+    size_t l = strlen(p);
+
+    while(l && (p[l - 1] == '\r' || p[l - 1] == '\n'))
+    {
+        p[--l] = 0;
+    }
+}
+
+static WifiStatus ReadLine(char *buff, size_t maxlen)
+{
+    size_t len = 0;
+    WifiStatus status;
+    unsigned char c;
+
+    while(len < maxlen && ((status = GetByte(&c)) == eWifiOK))
+    {
+        buff[len++] = c;
+        buff[len] = 0;
+
+        if (len > 1)
+        {
+            if (buff[len - 1] == '\n' && buff[len - 2] == '\r')
+            {
+                Chomp(buff);
+                return eWifiOK;
+            }
+        }
+    }
+
+    return eWifiFailedToReceive;
+}
+
+static WifiStatus SendATCommand(const char *command)
+{
+    char line[80];
+
+    WifiStatus status;
+
+    if((status = SendToModem(command, strlen(command))) != eWifiOK)
+    {
+        return status;
+    }
+
+    if((status = ReadLine(line, sizeof line)) != eWifiOK)
+    {
+        return status;
+    }
+
+    return strcmp("OK", line) == 0 ? eWifiOK : eWifiFailedToSendCommand;
+}
+
 
 /* ---------------------------------------- PUBLIC ROUTINES
 */
@@ -153,18 +211,23 @@ WifiStatus WifiConnect(void)
     return ConnectToModem();
 }
 
-WifiStatus ConnectURL(const char *method, const char *url)
+WifiStatus ConnectURL(int is_post, const char *url, size_t *content_length)
 {
     char hostname[MAX_HOSTNAME_LEN];
     char path[MAX_PATH_LEN];
     int port;
     int ssl;
-    WifiStatus status = ParseURL(url, hostname, path, &port, &ssl);
+    WifiStatus status;
 
-    printf("hostname='%s'\n", hostname);
-    printf("path='%s'\n", path);
-    printf("port=%d\n", port);
-    printf("ssl=%d\n", ssl);
+    if (!ParseURL(url, hostname, path, &port, &ssl))
+    {
+        return eWifiInvalidURL;
+    }
+
+    if ((status = SendATCommand("AT+CIPMUX=0\r\n")) != eWifiOK)
+    {
+        return status;
+    }`
 
     return eWifiTimeout;
 }
diff --git a/wifi.h b/wifi.h
index 9a8ee71..92a48a3 100644
--- a/wifi.h
+++ b/wifi.h
@@ -39,16 +39,20 @@ typedef enum
    eWifiFailedToWrite,
    eWifiFailedToReceive,
    eWifiTimeout,
-   eWifiInvalidURL
+   eWifiInvalidURL,
+   eWifiFailedToSendCommand,
+   eWifiBadHTTPStatusCode
 } WifiStatus;
 
 /* Connect to the wifi modem and return status.
 */
 WifiStatus WifiConnect(void);
 
-/* Connect to a URL.  Returns status.
+/* Connect to a URL.  Returns status.  If it is a post then *content_len holds
+   the length of the posted file.  If it is not a post (a get) then
+   *content_len holds the content length from the respose.
 */
-WifiStatus ConnectURL(const char *method, const char *url);
+WifiStatus ConnectURL(int is_post, const char *url, size_t *content_len);
 
 /* Sends a formatted string to the connection.  Returns status.
 */
-- 
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