"error can't alloc pcb" occurs when calling fetch API.

[pelikhan]

Discussed in #660

^{Originally posted by yuichisuzuki0601 November 8, 2023}

• The device is Raspberry Pi pico.
• I have confirmed that the device is connected to wifi.
• It happens when I make an http request.
• Timeout occurs when making https request.

error log

DEV> connecting to tcp://192.168.0.8:8080
DEV> socket tcp://192.168.0.8:8080 error can't alloc pcb
DEV> Unhandled exception
DEV> Exception: Error
DEV>  message: socket tcp://192.168.0.8:8080: can't alloc pcb
DEV>  at _connect [as F38_pc214] (node_modules/@devicescript/net/src/sockets.ts:158:29)
DEV>  at connect [as F20_pc7] (node_modules/@devicescript/net/src/sockets.ts:172:5)
DEV>  at fetch [as F15_pc534] (node_modules/@devicescript/net/src/fetch.ts:174:5)
DEV>  at inline [as F8_pc23] (src/main.ts:47:5)
DEV>  at emit [as F64_pc24] (node_modules/@devicescript/core/src/events.ts:23:17)
DEV> Unhandled exception
DEV> stop program
DEV> connection error: "sock write error"
DEV> connection error: "sock write error"
DEV> connection error: "sock write error"
DEV> connection error: "sock write error"
DEV> connection error: "sock write error"

I want to know the cause and solution.

[PiotrKasperski]

i've got similaar problem.
When i'm trying to connect my local hivemq server i'm getting:

DEV> mqtt: socket connecting to 192.168.1.152:1883
DEV> connecting to tcp://192.168.1.152:1883
DEV> socket tcp://192.168.1.152:1883 error can't alloc pcb
DEV> mqtt: disconnect

Connection to tcp://broker.hivemq.com work fine, also i'm sure my server work's good.