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martin-ger / esp_mqtt

MQTT Broker/Bridge on the ESP8266
MIT License
295 stars 69 forks source link

Size #3

Closed scargill closed 6 years ago

scargill commented 6 years ago

Hi

This looks great but... 8 clients? I think my little IOT setup has about 15 ESP8266s talking to the broker - any chance of increasing that number or porting to the (now much cheaper than a few months ago) ESP32??

martin-ger commented 6 years ago

Hi,

sorry, 8 WiFi clients for the SoftAP and max. 10 TCP connections are hard limits in Espressif's ESP8266 SDK code. In addition each MQTT connection needs some KB buffer space. This imposes another limit. Could be reduced, as messages are usually small. But again: 8-10 is the absolute limit. Connecting two brokers and bridging between them might solve a small problem in some cases.

Porting to the ESP32 might be an option, but there are again limits on the number of clients as far as I understood. And I just learned from you that the ESP32 has become significantly cheaper (cheaper than the RasPi ZeroW, which is surely the better plattform for a full broker (Linux+Mosquitto)).

martin-ger commented 6 years ago

With new queue config, up to 13 clients (in STA mode) can connect. A common out queue might even save more RAM...