Hello, I am observing repeated failures trying to send a post request via SSLClient using my SIMCOM7600G modem with TinyGSM.
The most common and consistent error message:
[318168][E][ssl__client.cpp:401] init_tcp_connection(): Connection to server failed, is the signal good, server available at this address and timeout sufficient? reusables.hyperether.com:443
[319175][E][ssl__client.cpp:46] _handle_error(): [start_ssl_client():371]: (-2) BIGNUM - An error occurred while reading from or writing to a file
[319177][E][SSLClient.cpp:242] connect(): start_ssl_client failed: 0
I have tried to set headers to adjust the time out like so:
client.connectionKeepAlive();
client.setHttpWaitForDataDelay(5000);
client.sendHeader("Keep-Alive", "timeout=1000, max=5000");
int err = client.post(API_ENDPOINTS.container, "application/json", body);
where body is a relatively small json payload:
{
"mode": "return-containers",
"data": {
"containerIds": [
"64367339246bf8633c782348"
],
"locationId": "6621a0099cf68973c58f68bf"
}
}
Here is my setup code:
#define TINY_GSM_MODEM_SIM7600
#define TINY_GSM_RX_BUFFER 2048
#include <TinyGsmClient.h>
#include <ThingerTinyGSM.h>
HardwareSerial gsmSerial(1);
TinyGsm modem(gsmSerial);
TinyGsmClient gsmClient(modem, 0);
SSLClient secure_layer_lte(&gsmClient);
HttpClient lte_ssl_client = HttpClient(secure_layer_lte, API_HOST, PORT);
void lteInit() {
gsmSerial.begin(BAUD_RATE, SERIAL_8N1, LTE_RX, LTE_TX, false);
secure_layer_lte.setCACert(api_root_ca);
modem.init();
modem.setNetworkMode(38);
modem.sendAT("AT+CMNB=1");
modem.gprsConnect(APN);
};
Then I use a RTOS task to monitor the connection and reconnect as needed:
void lteConnect(void * parameter) {
lteInit();
for (;;) {
if (modem.isNetworkConnected()) {
if (modem.isGprsConnected()) {
vTaskDelay(20000 / portTICK_PERIOD_MS);
} else {
modem.gprsConnect(APN);
};
} else {
bool networkConnected = modem.waitForNetwork();
};
vTaskDelay(5000 / portTICK_PERIOD_MS);
};
vTaskDelete(NULL);
};
What confuses me the most is that sometimes the request will go through and I'll get a 200 back as if nothing is wrong, but the vast majority of the time, I get the error pasted above.
I have run a test on signal quality to assess, and I will get a mix of 99 back as a value and anything from 28-31 at other points. Running on an interval of one second might produce output like: [99, 31, 31, 31, 99, 27, 99, 99, 99, 28] which also confuses me. My understanding is that a value of 99 for signal quality from TinyGSM means it could not retrieve the value, 31 is the best quality possible and that a value of 0 would mean there was no reception at all.
Any ideas what I'm doing wrong or inconsistently? I know the error is being thrown by this library, but very possible some other culprit is to blame here. I have the same functionality working perfectly over WiFi, where I provide the WiFi client to the "client.post" function I pasted above, also with SSL also via this library.
Very puzzled. Any thoughts greatly appreciated. I commented on a recent PR for this library that I thought might address the issue but it has not been resolved in my case, I am on version 1.2.0.
Platform.ini
[env:esp32-s3-devkitc-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
monitor_filters = esp32_exception_decoder
lib_deps =
bblanchon/ArduinoJson@7.0.3
vshymanskyy/TinyGSM@0.11.7
makuna/NeoPixelBus@2.7.8
arduino-libraries/ArduinoHttpClient@0.6.0
digitaldragon/SSLClient@1.2.0
thinger-io/thinger.io@2.27.0
bblanchon/StreamUtils@1.8.0
Hello, I am observing repeated failures trying to send a post request via SSLClient using my SIMCOM7600G modem with TinyGSM.
The most common and consistent error message:
I have tried to set headers to adjust the time out like so:
where body is a relatively small json payload:
Here is my setup code:
Then I use a RTOS task to monitor the connection and reconnect as needed:
What confuses me the most is that sometimes the request will go through and I'll get a 200 back as if nothing is wrong, but the vast majority of the time, I get the error pasted above.
I have run a test on signal quality to assess, and I will get a mix of 99 back as a value and anything from 28-31 at other points. Running on an interval of one second might produce output like:
[99, 31, 31, 31, 99, 27, 99, 99, 99, 28]which also confuses me. My understanding is that a value of99for signal quality from TinyGSM means it could not retrieve the value, 31 is the best quality possible and that a value of 0 would mean there was no reception at all.Any ideas what I'm doing wrong or inconsistently? I know the error is being thrown by this library, but very possible some other culprit is to blame here. I have the same functionality working perfectly over WiFi, where I provide the WiFi client to the "client.post" function I pasted above, also with SSL also via this library.
Very puzzled. Any thoughts greatly appreciated. I commented on a recent PR for this library that I thought might address the issue but it has not been resolved in my case, I am on version 1.2.0.
Platform.ini