wifi.Rssi - 從char *轉換爲uint8_t

Question

錯誤爲'invalid conversion from 'char*' to 'uint8_t {aka unsigned char}' [-fpermissive]'。我正在嘗試使用ssid從網絡獲取rssi，而無需直接連接到它。

char ssid[]="GreenNET"; 
void updateRSSI(){ 
    rssi = WiFi.RSSI(ssid); 
    Serial.print(rssi); 
    Serial.print(" dBm"); 
    Serial.println(); 
} 

https://www.arduino.cc/en/Reference/WiFiRSSI

Answer 1

WiFi.RSSI需要網絡指標，而不是一個SSID字符串：

char ssid[] = "GreenNET" 
uint8_t available_networks = WiFi.scanNetworks(); 
for (uint8_t net = 0; net < available_networks; ++net) 
{ 
    if (strcmp(WiFi.SSID(net), ssid) == 0) 
    { 
    rssi = WiFi.RSSI(net); 
    Serial.print(rssi); 
    Serial.print(" dBm"); 
    Serial.println(); 
    break; 
} 
}