scan/ellsi: passing MSG_WAITALL has no effect for UDP

MultiCAN/src/drivers/scan/ellsi.c

@@ -226,16 +226,17 @@ static ssize_t ellsi_read(void *pvt, struct can_frame *frame) {
     ellsiCanTelegram *this;
 
     while (state->unread == 0) {
-        nbytes = recv(state->sock, &state->msg, sizeof(state->msg), MSG_WAITALL);
-        debug("ellsi_read: got cmd %d subcmd %d more bytes %d\n",
-            ntohl(state->msg.header.command),
-            ntohl(state->msg.header.subcommand),
-            ntohl(state->msg.header.payloadLen));
+        nbytes = recv(state->sock, &state->msg, sizeof(state->msg), 0);
         if (nbytes < 0) {
             errbuf_t buf;
-            fprintf(stderr, "ellsi_read: recv failed (%s)\n", ERRNO_STR(buf));
+            fprintf(stderr, "ellsi_read(%d): recv failed (%s)\n", state->sock, ERRNO_STR(buf));
             return -1;
         }
+        debug("ellsi_read(%d): got cmd %d subcmd %d paylod length %d\n",
+            state->sock,
+            ntohl(state->msg.header.command),
+            ntohl(state->msg.header.subcommand),
+            ntohl(state->msg.header.payloadLen));
         if (state->msg.header.magic != htonl(ELLSI_MAGIC)) {
             fprintf(stderr, "ellsi_read(%d): bad magic\n", state->sock);
             return -1;
@@ -302,7 +303,7 @@ static int ellsi_check(int sock) {
     int r;
 
     memset(&ack, 0, sizeof(ack));
-    r = recv(sock, &ack, sizeof(ack), MSG_WAITALL);
+    r = recv(sock, &ack, sizeof(ack), 0);
     if (r < 0) {
         if (errno != EAGAIN && errno != EWOULDBLOCK) {
             errbuf_t buf;