incomplete message received

[sanderkob]

AsyncTelegram2 version 2.2.1 and 2.2.2 board ESP8266 No change to default format style, so it is HTML. Built with VisualStudioCode PlatformIO, default board params.

I occasionally get an incomplete error, generated in this code https://github.com/cotestatnt/AsyncTelegram2/blob/526027396a3ac208d36c54f8eea09c06a51a866d/src/AsyncTelegram2.cpp#L240-L253

The json buffer is large enough, I checked this by sending additional info to my chat (the code added to AsyncTelegram2.cpp is in https://gist.github.com/sanderkob/693cf1c7664d2048fde183263edff221 ) I try to solve this without serial logging. The output from the additional code is:

[ERROR] - No memory: inrease buffer size with "setJsonBufferSize(buf_size)" method
[ERROR] - deserializeJson() failed
IncompleteInput
[ERROR] - rxbuffer

{"ok":true,"result":[
[ERROR] - JsonBufferSize
4096
[ERROR] - rxbuffer len msg
23
[ERROR] - content len msg
23

It appears that the intended message to be received is {"ok": true,"result": []} (with 25 chars) and deserialization fails because the last two chars are actually missing. The content of m_rxbuffer as sent to my chat is {"ok": true,"result": [ with 21 chars However, m_rxbuffer len and content len are both 23 chars.

So, the primary question is: why is the message truncated (]} missing)? In addition, why are spaces missing in the message that shows the content of m_rxbuffer?

To further investigate, I looked at the code https://github.com/cotestatnt/AsyncTelegram2/blob/526027396a3ac208d36c54f8eea09c06a51a866d/src/AsyncTelegram2.cpp#L164C9-L173

If the intent is to timeout after one sec, I would expect the code to be for (uint32_t timeout = millis(); (millis() - timeout < 1000) && pos < len;) to ensure that the loop exits after 1000 milliseconds or when pos reaches len. However, I do not think this is relevant to the problem at hand.

[sanderkob]

Some additional information. I have two telegram bots on ESP8266 that use AsyncTelegram2; the error occurs in both. Occurrence is of the order of 1 in 10^5 (10 ppm), i.e. once in every 100.000 getUpdates.. The error is independent of : rx,tx buffersize - setBufferSizes() 512, 2048 json buffersize - setJsonBufferSize() 1024, 2048 TCP_MSS size - lwip version 2.0.3, low memory (default) TCP_MSS = 536, high bandwith TCP_MSS = 1460 CPU frequenty - 80, 160 MHz

Are there any other factors to check? Since the error is not detrimental to my applicatrion I could safely ignore it.