More on TCP

src/CMakeLists.txt

@@ -28,6 +28,7 @@ pico_enable_stdio_usb(${CMAKE_PROJECT_NAME} 0)
 target_link_libraries(${CMAKE_PROJECT_NAME}
   pico_stdlib
   pico_cyw43_arch_lwip_threadsafe_background
+  pico_lwip_http
 )
 
 pico_add_extra_outputs(${CMAKE_PROJECT_NAME})

src/abfall.cpp

@@ -2,14 +2,17 @@
 
 #include <string>
 
+#include "lwip/apps/http_client.h"
 #include "pico/cyw43_arch.h"
 #include "pico/stdlib.h"
 
 using std::string;
 
-int wifi_setup(uint32_t country, const string &ssid, const string &pw) {
+int wifi_setup(uint32_t country, const string &ssid, const string &pw, bool firstTry = true) {
-    if (cyw43_arch_init_with_country(country)) {
+    if (firstTry) {
-        return 1;
+        if (cyw43_arch_init_with_country(country)) {
+            return 1;
+        }
     }
 
     cyw43_arch_enable_sta_mode();
@@ -28,6 +31,9 @@ int wifi_setup(uint32_t country, const string &ssid, const string &pw) {
 
         if (status_new != status) {
             status = status_new;
+            if (status < 0) {
+                continue;
+            }
             flashrate = flashrate / (status + 1);
             printf("Connect status: %d %d\n", status, flashrate);
         }
@@ -48,6 +54,38 @@ int wifi_setup(uint32_t country, const string &ssid, const string &pw) {
     return status;
 }
 
+char myBuffer[2048];
+
+void result_callback(void *arg, httpc_result_t httpc_result, u32_t rx_content_len, u32_t srv_res,
+                     err_t err) {
+    printf("Transfer complete\n");
+    printf("Local result=%d\n", httpc_result);
+    printf("Http result=%d\n", srv_res);
+}
+
+err_t headers_callback(httpc_state_t *connection, void *arg, struct pbuf *hdr, u16_t hdr_len,
+                       u32_t content_len) {
+    printf("Headers received\n");
+    printf("Content length=%d\n", content_len);
+    printf("Header length=%d\n", hdr_len);
+
+    pbuf_copy_partial(hdr, myBuffer, hdr->tot_len, 0);
+    printf("Headers \n");
+    printf("%s", myBuffer);
+
+    return ERR_OK;
+}
+
+err_t body_callback(void *arg, struct altcp_pcb *conn, struct pbuf *p, err_t err) {
+    printf("Body\n");
+    pbuf_copy_partial(p, myBuffer, p->tot_len, 0);
+    printf("%s", myBuffer);
+
+    // TODO: Parse CSV
+
+    return ERR_OK;
+}
+
 int main() {
     const string ssid{"Apis cerana"};
     const string pw{"2JkJEh2vptVT"};
@@ -55,7 +93,28 @@ int main() {
 
     stdio_init_all();
 
-    wifi_setup(country, ssid, pw);
+    bool firstTry = true;
+    int res = -1;
+    do {
+        if (firstTry) {
+            res = wifi_setup(country, ssid, pw, true);
+            firstTry = false;
+        } else {
+            printf("Setting up connection failed. Trying again after 5 sec...\n");
+            sleep_ms(5000);
+            res = wifi_setup(country, ssid, pw, false);
+        }
+
+    } while (res != CYW43_LINK_UP);
+
+    uint16_t port = 80;
+    httpc_connection_t settings;
+    settings.result_fn = nullptr;
+    settings.headers_done_fn = nullptr;
+
+    err_t err = httpc_get_file_dns("beenas.brodbeck-online.de", port, "/abfall/abfall.csv",
+                                   &settings, body_callback, nullptr, nullptr);
+    printf("Status %d\n", err);
 
     while (true) {
         sleep_ms(1);