feat(ble): Read the advertised device name from a file

epicardium/ble/ble_main.c

@@ -328,6 +328,24 @@ static void bleSetup(bleMsg_t *pMsg)
   char buf[32];
   char a, b, c, d, e, f, K;
 
+  // read the device name from file
+  int name_length = fs_read_text_file("device_name.txt", buf, sizeof(buf));
+  // check if the file was present and contained data
+  if (name_length > 0) {
+    // truncate name_length to the maximum length a device name can be (bleScanDataDisc[0] - 1)
+    if (bleScanDataDisc[0] - 1 < name_length)
+      name_length = bleScanDataDisc[0] - 1;
+    // now copy the name
+    memcpy(bleScanDataDisc + 2, buf, name_length);
+    // if the name is shorter than the maximum device name length
+    // we pad the rest with spaces
+    while(name_length < bleScanDataDisc[0] - 1) {
+      bleScanDataDisc[2 + name_length++] = ' ';
+    }
+  }
+  else
+  {
+    // if the device_name file was not present use the default name with the mac address
     if (fs_read_text_file("mac.txt", buf, sizeof(buf)))
     {
       if (sscanf(buf, "%c%c:%c%c:%c%c:%c%c:%c%c:%c%c", &K,&K,&K,&K,&K,&K, &a, &b, &c, &d, &e, &f) == 12)
@@ -340,6 +358,7 @@ static void bleSetup(bleMsg_t *pMsg)
         bleScanDataDisc[14] = f;
       }
     }
+  }
   
   /* set advertising and scan response data for discoverable mode */
   AppAdvSetData(APP_ADV_DATA_DISCOVERABLE, sizeof(bleAdvDataDisc), (uint8_t *) bleAdvDataDisc);