dist/common: add last_sent_pos for debugging

dist/common/net.c

@@ -97,6 +97,7 @@ bool NetPeerAdd(const char *path, bool dev) {
   peer->is_dev = dev;
   peer->sock_fd = -1;
   peer->shm_fd = -1;
+  peer->last_sent_pos = -1;
   return true;
 }
 

dist/common/net.h

@@ -42,6 +42,7 @@ struct Peer {
   uint32_t local_pos_reported;
   // last position cleaned
   volatile uint32_t local_pos_cleaned;
+  uint32_t last_sent_pos;
 
   // rkey and base address of the remote queue to write to
   uint64_t remote_rkey;