change length for mqtt username and password

fix for #450

Signed-off-by: Bartlomiej Zimon <uzi18@o2.pl>

esp-link/config.c

@@ -23,7 +23,7 @@ FlashConfig flashDefault = {
   .slip_enable  = 0, .mqtt_enable = 0, .mqtt_status_enable = 0,
   .mqtt_timeout = 2, .mqtt_clean_session = 1,
   .mqtt_port    = 1883, .mqtt_keepalive = 60,
-  .mqtt_old_host  = "\0", .mqtt_old_password = "\0", .mqtt_clientid = "\0",
+  .mqtt_old_host  = "\0", .mqtt_old_password = "\0", .mqtt_old_username = "\0", .mqtt_clientid = "\0",
   .mqtt_username  = "\0", .mqtt_password = "\0", .mqtt_status_topic = "\0",
   .mqtt_host      = "\0",
   .sys_descr 	  = "\0",
@@ -161,6 +161,13 @@ bool ICACHE_FLASH_ATTR configRestore(void) {
       os_memset(flashConfig.mqtt_old_password, 0, 32);
   }
 
+  if (flashConfig.mqtt_username[0] == 0 && flashConfig.mqtt_old_username[0] != 0) {
+      // the mqtt_username got changed from 32 chars to 64 in a new location
+      os_printf("Converting old mqtt_username\n");
+      os_memcpy(flashConfig.mqtt_password, flashConfig.mqtt_old_username, 32);
+      os_memset(flashConfig.mqtt_old_username, 0, 32);
+  }
+
   if (flashConfig.data_bits == 0) {
       // restore to default 8N1
       flashConfig.data_bits = flashDefault.data_bits;

esp-link/config.h

@@ -23,8 +23,8 @@ typedef struct {
   uint16_t mqtt_port, mqtt_keepalive;  // MQTT Host port, MQTT Keepalive timer
   char     mqtt_old_host[32],          // replaced by 64-char mqtt_host below
            mqtt_clientid[48],
-           mqtt_username[32],
-           mqtt_old_password[32],      // replaced by 64-char mqtt_password below
+           mqtt_old_username[32],
+           mqtt_old_password[32],      // replaced by 70-char mqtt_password below
            mqtt_status_topic[32];
   char     sys_descr[129];             // system description
   int8_t   rx_pullup;                  // internal pull-up on RX pin
@@ -41,7 +41,8 @@ typedef struct {
   int8_t   data_bits;
   int8_t   parity;
   int8_t   stop_bits;
-  char     mqtt_password[64];          // MQTT password, was 32-char mqtt_old_password
+  char     mqtt_password[70];          // MQTT password, was 32-char mqtt_old_password
+  char     mqtt_username[70];          // MQTT username, was 32-char mqtt_old_username
 } FlashConfig;
 extern FlashConfig flashConfig;