dummyload:
First
When I make a faster serial then 9K6 I got garbage on the serial monitor
On the lower right corner of serial monitor you can set the baud rate of the monitor to match.
Just left of the monitor baud rate is end-of-input-line options.
When you send text from the monitor to Arduino you can have it add nothing, or newline or carriage return or both.
Default is to add nothing, usually you want to add a newline (char == 10) so your code knows end of line is reached.
And you define packetBuffer[] twice, once as a char array and in void loop() as a byte array.
Noooooooooooooooooooooooooooooo!
Comment the line
// char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
like this so it is not compiled.
Move the line
byte packetBuffer[]={0x02,0xff,0x26,0x8f,0x26,0x8f,0x00,0x3f,0x86,0xd3,0x53,0x54,0x41,0x54,0x55,0x53,0x3a,0x20,0x22,0x6e,0x61,0x6d,0x65,0x2d,0x31,0x22,0x20,0x22,0x22,0x20,0x30,0x20 };
up above loop() and setup() so that the array is global.
While you're at it, these are the bytes for the word netwerk-id
6e 65 74 77 65 72 6b 2d 69 64
And these are the bytes you put in byte packetBuffer[] that spell name-1
0x6e,0x61,0x6d,0x65,0x2d,0x31,