Fix compiler warnings over const losses.

extras/http_client_ota/http_buffered_client.c

@@ -19,7 +19,7 @@
 typedef void (*handle_http_token)(char *);
 
 struct http_token_table {
-    char *            token;
+    const char *      token;
     handle_http_token http_tock_cb;
 };
 

extras/http_client_ota/http_buffered_client.h

@@ -15,9 +15,9 @@ typedef enum  {
 } HTTP_Client_State;
 
 typedef struct  {
-    char *        server;
-    char *        port;
-    char *        path;
+    const char *  server;
+    const char *  port;
+    const char *  path;
     char *        buffer;
     uint16_t      buffer_size;
     http_final_cb buffer_full_cb;

extras/http_client_ota/http_client_ota.h

@@ -38,10 +38,10 @@ typedef enum {
  * Struct that contains all info for start ota.
  */
 typedef struct {
-    char *server;      /**< Server domain */
-    char *port;        /**< Server port   */
-    char *binary_path; /**< Server Path dowload new update binary */
-    char *sha256_path; /**< Server Path of SHA256 sum for check binary, could be NULL, check will be skipped */
+    const char *server;      /**< Server domain */
+    const char *port;        /**< Server port   */
+    const char *binary_path; /**< Server Path dowload new update binary */
+    const char *sha256_path; /**< Server Path of SHA256 sum for check binary, could be NULL, check will be skipped */
 } ota_info;
 
 /**

extras/rboot-ota/rboot-api.c

@@ -239,7 +239,7 @@ typedef struct __attribute__((packed)) {
 bool rboot_verify_image(uint32_t initial_offset, uint32_t *image_length, const char **error_message)
 {
     uint32_t offset = initial_offset;
-    char *error = NULL;
+    const char *error = NULL;
     RBOOT_DEBUG("rboot_verify_image: verifying image at 0x%08x\n", initial_offset);
     if(offset % 4) {
         error = "Unaligned flash offset";

extras/sntp/sntp.c

@@ -690,7 +690,7 @@ sntp_request(void *arg)
 void
 sntp_init(void)
 {
-  char *def_addr[] = {SNTP_SERVER_ADDRESS};
+  const char *def_addr[] = {SNTP_SERVER_ADDRESS};
 
   sntp_num_servers = 0;
   sntp_set_servers(def_addr, sizeof(def_addr) / sizeof(char*));
@@ -715,7 +715,7 @@ sntp_init(void)
 /**
  * Set the NTP servers
  */
-int sntp_set_servers(char *server_url[], int num_servers)
+int sntp_set_servers(const char *server_url[], int num_servers)
 {
   int i;
 

extras/sntp/sntp.h

@@ -52,7 +52,7 @@ void sntp_set_timezone(const struct timezone *tz);
  * Returns 0 if OK, less than 0 if error.
  * NOTE: This function must NOT be called before sntp_initialize().
  */
-int sntp_set_servers(char *server_url[], int num_servers);
+int sntp_set_servers(const char *server_url[], int num_servers);
 
 /*
  * Sets the update delay in ms. If requested value is less than 15s,

extras/ssd1306/ssd1306.c

@@ -1007,7 +1007,7 @@ int ssd1306_draw_char(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font
     return d->width;
 }
 
-int ssd1306_draw_string(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, char *str,
+int ssd1306_draw_string(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, const char *str,
         ssd1306_color_t foreground, ssd1306_color_t background)
 {
     uint8_t t = x;

extras/ssd1306/ssd1306.h

@@ -493,7 +493,7 @@ int ssd1306_draw_char(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font
  * @param background Background color
  * @return Width of the string  or negative value if error occured
  */
-int ssd1306_draw_string(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, char *str, ssd1306_color_t foreground, ssd1306_color_t background);
+int ssd1306_draw_string(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, const char *str, ssd1306_color_t foreground, ssd1306_color_t background);
 
 /**
  * Stop scrolling (the ram data needs to be rewritten)