MbedUDP: take into account write() errors

Author: facchinm

libraries/SocketWrapper/src/MbedUdp.cpp

@@ -76,13 +76,20 @@ int arduino::MbedUDP::endPacket() {
 
 // Write a single byte into the packet
 size_t arduino::MbedUDP::write(uint8_t byte) {
- uint8_t buffer[1] = { byte };
- return _socket.sendto(_host, buffer, 1);
+ return write(&byte, 1);
 }
 
 // Write size bytes from buffer into the packet
 size_t arduino::MbedUDP::write(const uint8_t *buffer, size_t size) {
- return _socket.sendto(_host, buffer, size);
+ _socket.set_blocking(true);
+ _socket.set_timeout(1000);
+ nsapi_size_or_error_t ret = _socket.sendto(_host, buffer, size);
+ _socket.set_blocking(false);
+ _socket.set_timeout(0);
+ if (ret < 0) {
+ return 0;
+ }
+ return size;
 }
 
 int arduino::MbedUDP::parsePacket() {