UDP connection based on CMSIS library

That's another message telling you something which you must do - so do it!

If you don't know what a "modifiable lvalue" is, look it up in your 'C' textbook (it is a standard 'C' term), or google it ...

Parisa Mohamadi said:

I removed   addrUDP.addr=addr->addr; but still it doesn't work

Of course it won't - we've already established that you need to have the address!

That's another message telling you something which you must do - so do it!

If you don't know what a "modifiable lvalue" is, look it up in your 'C' textbook (it is a standard 'C' term), or google it ...

Parisa Mohamadi said:

I removed   addrUDP.addr=addr->addr; but still it doesn't work

Of course it won't - we've already established that you need to have the address!

Hello, Here is my program which works fine for broadcast.

int main (void){

netInitialize ();
Eth();

while(1){
Sendd();
osDelay(100);

}

}


NET_ADDR4 addrUDP={ NET_ADDR_IP4, 2020, 192, 168, 255, 255 };

uint32_t udp_cb_func (int32_t socket, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) {
	
	return 0;
}



void Eth(){
	
uint8_t mac_addr [NET_ADDR_ETH_LEN];
uint8_t ip4_addr [NET_ADDR_IP4_LEN];




socket = netUDP_GetSocket(udp_cb_func);
if (socket >= 0) {
netUDP_Open(socket, 2050);
}


void Sendd(void){

				sendbuf =  netUDP_GetBuffer (2);
				sendbuf[0]=65;sendbuf[0]=66;
				State=netUDP_Send (socket,(NET_ADDR *)&addrUDP, sendbuf,2);	
				

}

I received transmitted data in my PC. However, by specifying the remote IP(NET_ADDR4 addrUDP={ NET_ADDR_IP4, 2020, 192, 168, 100, 20 };) it doesn't work even it doesn't respond to ping command. I have added "netARP_CacheIP " function based on "http://www.keil.com/pack/doc/mw/Network/html/group__udp__user__api.html?_ga=2.246941447.2042184398.1570359907-552607041.1563512165" but it only helps me to ping the device properly. but it still doesn't send anything. Here is my code

int main (void){

netInitialize ();
Eth();

while(1){
Sendd();
osDelay(100);

}

}


NET_ADDR4 addrUDP={ NET_ADDR_IP4, 2020, 192, 168, 100, 20 };

uint32_t udp_cb_func (int32_t socket, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) {
	
	return 0;
}



void Eth(){
	
uint8_t mac_addr [NET_ADDR_ETH_LEN];
uint8_t ip4_addr [NET_ADDR_IP4_LEN];


netIP_aton ("192.168.100.100", NET_ADDR_IP4, ip4_addr);

while (netARP_GetMAC (NET_IF_CLASS_ETH | 0, ip4_addr, mac_addr) != netOK) {
  netARP_CacheIP (NET_IF_CLASS_ETH | 0, ip4_addr, netARP_CacheTemporaryIP);
  osDelay (1000);
}

socket = netUDP_GetSocket(udp_cb_func);
if (socket >= 0) {
netUDP_Open(socket, 2050);
}


void Sendd(void){

				sendbuf =  netUDP_GetBuffer (2);
				sendbuf[0]=65;sendbuf[0]=66;
				State=netUDP_Send (socket,(NET_ADDR *)&addrUDP, sendbuf,2);	
				

}

My computer address IP is 192.168.100.50 and both subnet mask is 255.255.0.0 . Ping shows me that "192.168.100.100" is available on my network but it doesn't send anything to the remote IP ( after setting broadcast IP 192.168.255.255 and removing 

netIP_aton ("192.168.100.100", NET_ADDR_IP4, ip4_addr);

while (netARP_GetMAC (NET_IF_CLASS_ETH | 0, ip4_addr, mac_addr) != netOK) {
  netARP_CacheIP (NET_IF_CLASS_ETH | 0, ip4_addr, netARP_CacheTemporaryIP);
  osDelay (1000);
}

it sends a broadcast and complete message to my PC. what is my mistake?