Binding UDP socket to broadcast resulting in Guru Meditation Error

[thijsdv]

When binding a UDP socket to the broadcast address on a default port, the ESP throws a Guru Meditation Error.

Test:

import usocket as socket
# Assume STA_IF has a connection
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('', 49152))

Error thrown:

Guru Meditation Error of type LoadProhibited occurred on core  0. Exception was unhandled.
Register dump:
PC      : 0x400efd17  PS      : 0x00060530  A0      : 0x800df00d  A1      : 0x3ffcede0  
A2      : 0x3ffb7650  A3      : 0x3ffb7710  A4      : 0x00000002  A5      : 0x00000002  
A6      : 0x00000000  A7      : 0x00000001  A8      : 0x00000000  A9      : 0x3ffcedb0  
A10     : 0x00000000  A11     : 0x3ffcede0  A12     : 0x00000002  A13     : 0x00000002  
A14     : 0x0000002a  A15     : 0x3ffcef90  SAR     : 0x00000006  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000010  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  

Backtrace: 0x400efd17:0x3ffcede0 0x400df00d:0x3ffcee10 0x400db56c:0x3ffcee30 0x400db5d4:0x3ffcee50 0x400e83ac:0x3ffcee70 0x400df133:0x3ffcef10 0x400db56c:0x3ffcef90 0x400db599:0x3ffcefb0 0x400f3369:0x3ffcefd0 0x400f35b3:0x3ffcf070 0x400ee5b3:0x3ffcf0b0

[dpgeorge]

Thanks for the report. The problem was that the code did not have a special case to handle empty host strings. Fixed by 1365f7f