TZUTC: -0800   
   MSGID: 56681.sync_sys@1:103/705 2b922a50   
   PID: Synchronet 3.20a-Linux master/9d3a8113d Nov 04 202 GCC 12.2.0   
   TID: SBBSecho 3.21-Linux master/9d3a8113d Nov 04 2024 11:37 GCC 12.2.0   
   BBSID: VERT   
   CHRS: ASCII 1   
   https://gitlab.synchro.net/main/sbbs/-/issues/813#note_5911   
      
   A likely area of the cause of issue is `comOpen()` in `src/comio/comio_nix.c`.   
      
   If you don't mind experimenting, you could print out the values returned from   
   `tcgetattr()`, by modifying this code in `comio_nix.c`, e.g. adding   
   ```   
   printf("c_iflag = %x\n", t.c_iflag);   
   printf("c_oflag = %x\n", t.c_oflag);   
   printf("c_cflag = %x\n", t.c_cflag);   
   printf("c_lflag = %x\n", t.c_lflag);   
   ```   
   At about line 218, before any changes to these values are made. This would be   
   particularly interesting to see *after* running any programs that successfully   
   communicate with the modem (e.g. minicom).   
      
   I would expect the `write()` function calls from this same file to be failing   
   (i.e. from `comWriteByte()` which is used when sending commands to the modem   
   from sexpots), but based on the log output you pasted here, no errors are   
   seen. Instrumenting `comWriteByte()` might provide some sanity checking:   
   e.g.   
   ```   
   bool comWriteByte(COM_HANDLE handle, BYTE ch)   
   {   
       int ret = write(handle, &ch, 1);   
       printf("write returned %d\n", ret);   
       return ret==1;   
   }   
   ```   
   In working scenario, that should just print a bunch of "write returned 1"   
   lines to stdout. Any value other than 1 would be interesting.   
   --- SBBSecho 3.21-Linux   
    * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)   
   SEEN-BY: 90/1 103/705 105/81 106/201 124/5016 128/187 153/757 7715   
   SEEN-BY: 154/10 30 203/0 218/700 221/0 226/30 227/114 229/110 114   
   SEEN-BY: 229/206 317 400 426 428 470 550 700 705 240/1120 5832 266/512   
   SEEN-BY: 280/464 5003 5006 282/1038 291/111 292/8125 301/1 320/219   
   SEEN-BY: 322/757 341/66 234 342/200 396/45 423/120 460/58 256 1124   
   SEEN-BY: 467/888 633/280 712/848 770/1 5020/400 8912 5054/30 5075/35   
   PATH: 103/705 280/464 460/58 229/426