Send struct data

[Damien]

Good morning,

I have a projet of connected beehive. I want to follow the weight, the temperature and the humidity.
I use several sensors and I need to send data using 2 E220-400T30D Ebyte modules.
I can send a single value (for example the weight). I use the different examples in the librairy.
But I can’t send all the value with an array.

Here is a part of my sender header :

#define ENABLE_RSSI true
#define RUCHER "Ruche1"
struct Message {
  char ruche[10]; //ruche = beehive in english
  float poids; //poids= weight in english
};

and in sender void loop

for (float poids=0; poids<100; poids++) //for the test, I increase manually the variable poids to simulate a weight variation. In reality the weight will come from a sensor.
{

  struct Message msg = {RUCHER, poids}; // for the test I only try to send the name of my beehive "Ruche1" and the weight poids
    // Send message
  ResponseStatus rs = e220ttl.sendFixedMessage(0, 3, 23, &msg, sizeof(Message));
  // Check If there is some problem of succesfully send
  
  // Print the data send

    
    Serial.print("Message Array length : ");Serial.println(sizeof(msg.ruche));
    Serial.println(msg.ruche);
    Serial.print("Poids Array length : ");Serial.println(sizeof(msg.poids));   
    Serial.println(msg.poids);
    
    Serial.println(rs.getResponseDescription());
    Serial.println(sizeof(Message));
    
    delay(10000);
}

For the receiver, the header is the same
In receiver void loop I have the following code :

    // Print the data received
    Serial.println(rsc.status.getResponseDescription());
    struct Message msg = *(Message*) rsc.data;
    Serial.println(msg.ruche);
    Serial.println(msg.poids);
    Serial.println(sizeof(Message));
    rsc.close();

And the result shown in serial monitor for the sender :

Message Array length : 10
Ruche1
Poids Array length : 4
2.00
Success
14

but in serial monitor for the receiver I have :

Message received! <——– my message is received
Success <——– success in transmission
<——– nothing but should be Ruche1
0.00 <——– 0.00 but should be 2.00
14

I don’t understand why the value are not correctly received…
Is someone could help me please ?

Thank you very much

Damien

[Damien]

Good morning,

maybe an idea. It seems to work properly when RSSI is disabled.
Is there a specfic wiring when RSSI is enabled ?

Regards

Damien

[Renzo Mischianti]

Hi,
for this first problem, I think It’s a wrong initialization of structure.
Use a string with 10 characters and retry.
Bye RM

[Damien]

Good morning,

other point, when I try to set configuration, I have the following message :

No response from device! (Check wiring)
12

What I don’t understand is I can send and receive structured data when I disabled RSSI in my program. But I think the problem could come from configuration settings.
My wiring is normal (M0 and M1 to GND, Aux Pullup with 4,7kohm, TX to Pin 2 of arduino uno with a 4,7kohm between 3,3V and the pin, RX connected to pin 3 of arduino uno with the 1kohm resistance (voltage divider).

I strictly respect the Standard configuration (Transparent) wiring.
When I use the examples (02_SendTransparentTransmission and 07_receiveMessages) i can send and receive structured data, it works fine, I can modify the program to adjust what I want to send. Everything is OK.
So I think the problem comes from the configuration settings that I can’t modify.

How is it possible to have a message “No response from device! (Check wiring)” when I try to set configuration whereas I can communicate between my 2 arduinos with E220 which confirms my wiring is correct ?

Regards

Damien

[Damien]

Good morning,

I tried with the fully connected shema to be able to set up configuration options.
There is stil the message “No response from device! (Check wiring)”.

It prints a configuration even if there is no response from the device.

What is completely strange is when I send different programs in my arduino and between each transfer I use the GetConfiguration program I have different results whereas I don’t change the configuration. Example :

No response from device! (Check wiring)
12
—————————————-
HEAD : AE 2 76

AddH : D2
AddL : 81

Chan : 205 -> 615MHz

SpeedParityBit : 0 -> 8N1 (Default)
SpeedUARTDatte : 0 -> 1200bps
SpeedAirDataRate : 0 -> 2.4kbps

OptionSubPacketSett: 0 -> 200bytes (default)
OptionTranPower : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 0 -> Disabled (default)

TransModeWORPeriod : 10 -> 1500ms
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeFixedTrans: 0 -> Transparent transmission (default)
—————————————-
No response from device! (Check wiring)
12
—————————————-
HEAD: 0 0 97
Model no.: 6E
Version : 73
Features : 70
—————————————-

Then
—————————————-
HEAD : 28 43 68

AddH : 65
AddL : 63

Chan : 119 -> 529MHz

SpeedParityBit : 1 -> 8O1
SpeedUARTDatte : 11 -> 9600bps (default)
SpeedAirDataRate : 11 -> 4.8kbps

OptionSubPacketSett: 0 -> 200bytes (default)
OptionTranPower : 0 -> 30dBm (Default)
OptionRSSIAmbientNo: 1 -> Enabled

TransModeWORPeriod : 1 -> 1000ms
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeFixedTrans: 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
—————————————-
No response from device! (Check wiring)

and after

No response from device! (Check wiring)
12
—————————————-
HEAD : 0 0 74

AddH : 7C
AddL : DC

Chan : 205 -> 615MHz

SpeedParityBit : 0 -> 8N1 (Default)
SpeedUARTDatte : 0 -> 1200bps
SpeedAirDataRate : 0 -> 2.4kbps

OptionSubPacketSett: 0 -> 200bytes (default)
OptionTranPower : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 0 -> Disabled (default)

TransModeWORPeriod : 10 -> 1500ms
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeFixedTrans: 0 -> Transparent transmission (default)
—————————————-
No response from device! (Check wiring)
12
—————————————-
HEAD: 0 0 97
Model no.: 6E
Version : 73
Features : 70
—————————————-

How this can be possible ????

Regards

Damien

[Renzo Mischianti]

For the last problem, I think It can be a power supply problem or wrong wiring, or a fired LoRa device.
But you must try to change something to find the correct solution.
Bye Renzo

[george_santiago]

Hi Renzo

I had a similar problem and I think I found the source of the bug.
The bug occurs when using a String type variable for the message. The Sender does not send the last character of the String.
Ex: When sending “101”, the Sender sends “10”, that is, it does not send the last character.
Ex:

static int msg = 100;
msg++;
String msg_sent = String(msg);
Serial.print("Sent Message: ");
Serial.println(msg_sent);
ResponseStatus rs = e220ttl.sendMessage(msg_sent);

I think the bug is on line 831:
LoRa_E220.cpp#L831

At the moment:
byte size = message.length(); // sizeof(message.c_str())+1;

I changed it to:
byte size = message.length() + 1; // sizeof(message.c_str())+1;

Everything worked fine.

There are other parts of the code that may need fixing. (I haven’t tested yet)
Ex:Line 850:
LoRa_E220.cpp#L850

ResponseStatus LoRa_E220::sendFixedMessage(byte ADDH, byte ADDL, byte CHAN, const String message){
	byte size = message.length(); // sizeof(message.c_str())+1;

[george_santiago]

OBS: I am using RSSI Enabled
#define ENABLE_RSSI true

[Renzo Mischianti]

Thanks George for your information, I will try to retest the specific case soon.
Thanks again Renzo

[Renzo Mischianti]

Hi George,
I did some test, and the library work correctly, I think you don’t do the correct configuration on the booth device. To send and receive the RSSI, you must set the RSSI parameter on the boot device

	configuration.TRANSMISSION_MODE.enableRSSI = RSSI_ENABLED;

Use the precompiled configuration for sender and receiver that you can find in the examples.

Bye Renzo

[Damien]

Hi,

thank you for the responses.
When I wire directly M0 and M1 to the 3.3V, I’m able to set configuration and activate RSSI.
I will try again with the fully connected shema, but at least, I know I can set configuration.

I have another question to configure the power to 30dbm.
I put #define E220_30 in header
But when I try to put POWER_30 rather than POWER_22 in parameters, it doesn’t recognize POWER_30.

An idea ?

[Renzo Mischianti]

Hi,
you must set the correct frequency.

Ebyte LoRa E220 LLCC68 device for Arduino, esp32 or esp8266: library – 2

Bye Renzo

[Author]

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