Hi, I am using the TCP raw API for a tiny-tiny telnet implementation. I am enqueuing output data using tcp_write(). Actually I am currently using tcp_write() to do all the queueing job by calling it even 10 or 20 times in a row with small amount of data, especially when output is mostly made of static strings.
Finally, once the telnet output of the processed shell command is enqueued, I am calling tcp_output() in order to improve telnet shell responsiveness. While I am queuing less data than TCP_MSS, everything works perfectly. However, if I am queueing more than TCP_MSS but still less than TCP_SND_BUF, I am starting having the following assert: "last_unsent->oversize_left >= oversize_used unsent_oversize mismatch (pcb->unsent is NULL)" Generally followed by this assert for each next tcp_write(): "tcp_write: pbufs on queue => at least one queue non-empty tcp_receive: valid queue length" Note that tcp_write() always returns ERR_OK. Also, I am calling tcp_write() and tcp_output() out of the lwIP thread, I supposed the lwIP RAW API thread safe. Here are the relevant part of lwipopts.h: #define MEMP_NUM_TCP_PCB 10 #define MEMP_NUM_TCP_PCB_LISTEN 1 #define MEMP_NUM_TCP_SEG 12 #define TCP_TTL 255 #define TCP_WND 2048 #define TCP_QUEUE_OOSEQ 1 #define TCP_MSS 1024 #define TCP_SND_BUF 2048 #define TCP_SND_QUEUELEN 6 * TCP_SND_BUF/TCP_MSS #define TCP_MAXRTX 6 #define TCP_SYNMAXRTX 6 What I am doing wrong ? :-) Thank you very much. Sylvain
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