esp-open-sdk icon indicating copy to clipboard operation
esp-open-sdk copied to clipboard

Published 20 hours ago • verified publisher icon pfalcon

Number of concurrent sockets limited to 5

Open rikte88 opened this issue 7 years ago • 3 comments

Hi, as I understand, lwip limits the number of concurrent sockets to MEMP_NUM_TCP_PCB, which is defined in lwip/lwip/config/lwipopts.h as: #define MEMP_NUM_TCP_PCB (*((volatile uint32*)0x600011FC)) Printing the u32_t at this memory address results in 5. Is there any way this could be increased? I tried changing it to: #define MEMP_NUM_TCP_PCB 10 but it does not seem to work. Best regards Karl

rikte88 avatar Sep 13 '17 22:09 rikte88

That seems like an address, not an actual value with number of connections. I believe you need "MEMP_NUM_NETCONN". I add "-DMEMP_NUM_NETCONN=8" when building my stuff and need more connections.

nochkin avatar Sep 14 '17 00:09 nochkin

Thanks, I will try later today! I accidentally pasted without a code block, that address should be dereferenced, edited. However, I believe both need to be increased for TCP sockets. At https://github.com/mziwisky/esp8266-dev/blob/master/esphttpd/include/lwipopts.h it is defined as simply 5 with the comment MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.

rikte88 avatar Sep 14 '17 07:09 rikte88

Interestingly enough, I use "MEMP_NUM_NETCONN" to increase the number of connections specifically for esphttpd project. To be completely honest, I build it using esp-open-sdk tools while under esp-open-rtos.

nochkin avatar Sep 15 '17 04:09 nochkin