我使用以太网模块使用
Cayenne-Arduino-Library和
arduino_uip将数据上传到服务器.我想从
CayenneEthernet.h读取myip []
原版的:
// DHCP with domain
void begin(const char* auth,
const char* domain = BLYNK_DEFAULT_DOMAIN,
uint16_t port = BLYNK_DEFAULT_PORT,
const byte mac[] = _blynkEthernetMac)
{
BLYNK_LOG("Here we are");// I added this to find this function.
...
IPAddress myip = Ethernet.localIP();
BLYNK_LOG("My IP: %d.%d.%d.%d", myip[0], myip[1], myip[2], myip[3]);
}
编辑:
// DHCP with domain
int* begin(const char* auth,
const char* domain = BLYNK_DEFAULT_DOMAIN,
uint16_t port = BLYNK_DEFAULT_PORT,
const byte mac[] = _blynkEthernetMac)
{
...
IPAddress myip = Ethernet.localIP();
BLYNK_LOG("My IP: %d.%d.%d.%d", myip[0], myip[1], myip[2], myip[3]);
return myip;
}
Arduino代码:
#define CAYENNE_DEBUG // Uncomment to show debug messages
#define CAYENNE_PRINT Serial // Comment this out to disable prints and save space
#include <CayenneDefines.h>
#include <UIPEthernet.h>
#include <BlynkSimpleUIPEthernet.h>
#include <CayenneEthernetClient.h>
#define VIRTUAL_PIN V1
#define VIRTUAL_PIN V0
...
void setup(){
...
int *A=Cayenne.begin(token);
...
}
void loop(){
...
}
我收到此错误:
error: void value not ignored as it ought to be
题:
如何正确返回数组?
更新:
搜索后,Cayenne.begin()定义于CayenneEthernetClient.h
class CayenneEthernetClient : public CayenneClient
{
public:
void begin(const char* token, const byte mac[] = NULL)
{
BLYNK_LOG("HERE WE ARE 3");
Blynk.begin(token, CAYENNE_DOMAIN, CAYENNE_PORT, GetMACAddress(token, mac));
}
private:
const byte* GetMACAddress(const char* token, const byte mac[])
{
...
return _mac;
}
byte _mac[6];
};
CayenneEthernetClient Cayenne;
之后,在BlynkProtocol.h调用此开始函数
private:
int readHeader(BlynkHeader& hdr);
uint16_t getNextMsgId();
protected:
void begin(const char* auth) {
BLYNK_LOG("HERE WE ARE 2");
this->authkey = auth;
}
bool processInput(void);
之后,这个begin()在BlynkEthernet.h调用
// DHCP with domain
void begin( const char* auth,
const char* domain = BLYNK_DEFAULT_DOMAIN,
uint16_t port = BLYNK_DEFAULT_PORT,
const byte mac[] = _blynkEthernetMac)
{
Base::begin(auth);
BLYNK_LOG("Getting IP...");
BLYNK_LOG("HERE WE ARE 1");
if (!Ethernet.begin((byte*)mac)) {
BLYNK_FATAL("DHCP Failed!");
}
// give the Ethernet shield a second to initialize:
::delay(1000);
this->conn.begin(domain, port);
IPAddress myip = Ethernet.localIP();
BLYNK_LOG("My IP: %d.%d.%d.%d", myip[0], myip[1], myip[2], myip[3]);
}
这个begin()最终在BlynkArduinoClient.h被调用
void begin(const char* d, uint16_t p) {
BLYNK_LOG("HERE WE ARE 9");
domain = d;
port = p;
}
串行监视器上的输出:
06007
最佳答案 我认为修改代码甚至库的API都不是一个好主意.
我的方法是获取IP地址的方式与Cayenne库相同:调用Ethernet.localIP():
void setup() {
Cayenne.begin(token);
IPAddress myip = Ethernet.localIP();
}
P.S.:错误
void value not ignored as it ought to be
可能是因为你只修改了Cayenne类中三个重写的begin()方法之一.