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Description
Hello
ESP32 board does not connect with OBDII string name. Previously i used to connect with HC-05 and Nano but HC-05 is fragile.
Now I tried (some 100 tries) with esp32 and following code worked.
BluetoothSerial SerialBT;
uint8_t address[6] = { 0x00, 0x10, 0xCC, 0x4F, 0x36, 0x03 };
bool connected;
#define BT_DISCOVER_TIME 500000
esp_spp_sec_t sec_mask = ESP_SPP_SEC_NONE; // or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE to request pincode confirmation
esp_spp_role_t role = ESP_SPP_ROLE_MASTER; // or ESP_SPP_ROLE_MASTER
void setup() {
Serial.begin(38400);
//SerialBT.setPin(pin);
SerialBT.begin("ESP32", true, 10000);
//SerialBT.print()
Serial.println("The device started in master mode, make sure remote BT device is on!");
connected = SerialBT.connect(address, sec_mask, role);
if (connected) {
Serial.println("Connected Succesfully!");
} else {
while (!SerialBT.connected(10000)) {
Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app.");
}
}
SerialBT.print(( String) "AT Z");
SerialBT.print((const char) '\r');
delay(150);
printBT();
SerialBT.write((const uint8_t*) "AT E0",5);
delay(150);
printBT();
SerialBT.write((const uint8_t*) "AT L0",5);
delay(150);
printBT();
SerialBT.write((const uint8_t*) "AT S0",5);
delay(150);
printBT();
SerialBT.write((const uint8_t*) "AT SP 0",7);
delay(150);
printBT();
Serial.println("0100");
SerialBT.print(( String) "0100");
Serial.println("0100");
Serial.println("delay");
printBT();
delay(6000);
//SerialBT.print((const char) '\r');
printBT();
delay(1000);
}
void loop() {
SerialBT.write((const uint8_t*) "01051",5);
Serial.println("sending 01051");
delay(200);
printBT();
SerialBT.write((const uint8_t*) "0105",4);
Serial.println("sending 0105");
delay(200);
printBT();
SerialBT.write((const uint8_t*) "AT DP",5);
delay(200);
Serial.println("Protocol");
printBT();
}
void printBT()
{
while(SerialBT.available())
{
char c = SerialBT.read();
if(c == '>')
Serial.println();
Serial.write(c);
}
}Consequently the ELMDuino library Initialize funtion was changed as following
{
char command[10] = {'\0'};
connected = false;
// sendCommand_Blocking(SET_ALL_TO_DEFAULTS);
//delay(100);
sendCommand_Blocking(RESET_ALL);
delay(100);
sendCommand_Blocking(ECHO_OFF)
6F33
;
delay(100);
sendCommand_Blocking(LINEFEEDS_OFF);
delay(100);
sendCommand_Blocking(PRINTING_SPACES_OFF);
delay(100);
// // Set data timeout
// sprintf(command, SET_TIMEOUT_TO_H_X_4MS, dataTimeout / 4);
// sendCommand_Blocking(command);
// delay(100);
// Automatic searching for protocol requires setting the protocol to AUTO and then
// sending an OBD command to initiate the protocol search. The OBD command "0100"
// requests a list of supported PIDs 0x00 - 0x20 and is guaranteed to work
if ((String)protocol == "0")
{
// Tell the ELM327 to do an auto protocol search. If a valid protocol is found, it will be saved to memory.
// Some ELM clones may not have memory enabled and thus will perform the search every time.
sprintf(command, SET_PROTOCOL_TO_H_SAVE, protocol);
if (sendCommand_Blocking(command) == ELM_SUCCESS)
{
if (strstr(payload, RESPONSE_OK) != NULL)
{
// Protocol search can take a comparatively long time. Temporarily set
// the timeout value to 30 seconds, then restore the previous value.
uint16_t prevTimeout = timeout_ms;
timeout_ms = 6000;
int8_t state = sendCommand_Blocking("0100");
if (state == ELM_SUCCESS)
{
timeout_ms = prevTimeout;
connected = true;
delay(1000);
return connected;
}
else if (state == ELM_BUFFER_OVERFLOW)
{
while (elm_port->available())
elm_port->read();
}
timeout_ms = prevTimeout;
}
}
}
else
{
// Set protocol
sprintf(command, TRY_PROT_H_AUTO_SEARCH, protocol);
if (sendCommand_Blocking(command) == ELM_SUCCESS)
{
if (strstr(payload, RESPONSE_OK) != NULL)
{
connected = true;
return connected;
}
}
}
if (debugMode)
{
Serial.print(F("Setting protocol via "));
Serial.print(TRY_PROT_H_AUTO_SEARCH);
Serial.print(F(" did not work - trying via "));
Serial.println(SET_PROTOCOL_TO_H_SAVE);
}
// Set protocol and save
sprintf(command, SET_PROTOCOL_TO_H_SAVE, protocol);
if (sendCommand_Blocking(command) == ELM_SUCCESS)
{
if (strstr(payload, RESPONSE_OK) != NULL)
{
connected = true;
return connected;
}
}
if (debugMode)
{
Serial.print(F("Setting protocol via "));
Serial.print(SET_PROTOCOL_TO_H_SAVE);
Serial.println(F(" did not work"));
}
return connected;
}