Max bytes in one Serial.write

wwilcz · September 21, 2022, 4:34pm

Hello,

I'm trying to send 1000 byte array via serial without chopping it into smaller packages between 2 ESP32 boards. Is this even possible?

I increased the serial buffers to 1024, but only part of the package goes through - data gets corrupted after ~120 bytes.

What am I doing wrong?

Sender sketch

HardwareSerial Sender(2);

#define SERIAL_SIZE_RX  1024
#define Sender_Txd_pin 17
#define Sender_Rxd_pin 16
#define BYTE_BATCH 1000


struct STRUCT {
  uint8_t stat;
  uint16_t len;
  uint8_t fileArray[BYTE_BATCH];
} testStruct;


void setup() {
  Serial.begin(115200);
  Sender.begin(115200, SERIAL_8N1, Sender_Txd_pin, Sender_Rxd_pin);
  while (!Serial or !Sender) delay(1);
  Sender.setRxBufferSize(SERIAL_SIZE_RX);
  
  randomSeed(analogRead(0));
  delay(1000);

  testStruct.stat = 1;
  testStruct.fileArray[0] = testStruct.stat;
  for (uint16_t i = 3; i < BYTE_BATCH; i++)
  {
    testStruct.fileArray[i] = random(1, 254);
    testStruct.len++;
  }
  int ded = testStruct.len / 255;
  testStruct.fileArray[1] = testStruct.len / 255;
  testStruct.fileArray[2] = testStruct.len - (ded * 255);

  Sender.write(testStruct.fileArray, BYTE_BATCH);

  Serial.println("Sent data packet: ");
  Serial.print("stat = ");
  Serial.println(testStruct.stat);
  Serial.print("len = ");
  Serial.println(testStruct.len);
  Serial.println("DATA: ");
  for (uint16_t i = 3; i < (3 + testStruct.len); i++)
  {
    Serial.print(i);
    Serial.print(". ");
    Serial.println(testStruct.fileArray[i]);
  }
}

void loop() {

}

Receiver sketch:

HardwareSerial Sender(2);

#define SERIAL_SIZE_RX  1024
#define Sender_Txd_pin 17
#define Sender_Rxd_pin 16
#define BYTE_BATCH 1000



struct STRUCT {
  uint8_t stat;
  uint16_t len;
  uint8_t fileArray[BYTE_BATCH];
} testStruct;


void setup() {
  Serial.begin(115200);
  Sender.begin(115200, SERIAL_8N1, Sender_Txd_pin, Sender_Rxd_pin);
  while (!Serial or !Sender) delay(1);
  Sender.setRxBufferSize(SERIAL_SIZE_RX);


  delay(10);

}

void loop() {
  if (Sender.available())
  {
    Serial.println("Received data packet: ");
    testStruct.fileArray[0] = Sender.read();
    testStruct.fileArray[1] = Sender.read();
    testStruct.fileArray[2] = Sender.read();
    testStruct.stat = testStruct.fileArray[0];
    uint16_t ded = (uint16_t)testStruct.fileArray[1];
    uint16_t rest = (uint16_t)testStruct.fileArray[2];
    testStruct.len = (ded * 255) + rest;
    for (uint16_t i = 3; i < (3 + testStruct.len); i++)
    {
      testStruct.fileArray[i] = Sender.read();
    }
    Serial.print("stat = ");
    Serial.println(testStruct.stat);
    Serial.print("len = ");
    Serial.println(testStruct.len);
    Serial.println("DATA: ");
    for (uint16_t i = 3; i < (3 + testStruct.len); i++)
    {
      Serial.print(i);
      Serial.print(". ");
      Serial.println(testStruct.fileArray[i]);
    }
   
  }
}

Sender debug output:

18:23:47.339 -> ets Jul 29 2019 12:21:46
18:23:47.339 -> 
18:23:47.339 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
18:23:47.339 -> configsip: 0, SPIWP:0xee
18:23:47.339 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
18:23:47.339 -> mode:DIO, clock div:1
18:23:47.339 -> load:0x3fff0030,len:1344
18:23:47.339 -> load:0x40078000,len:13864
18:23:47.339 -> load:0x40080400,len:3608
18:23:47.339 -> entry 0x400805f0
18:23:48.535 -> Sent data packet: 
18:23:48.535 -> stat = 1
18:23:48.535 -> len = 997
18:23:48.535 -> DATA: 
18:23:48.535 -> 3. 245
18:23:48.535 -> 4. 134
18:23:48.535 -> 5. 147
18:23:48.535 -> 6. 108
18:23:48.535 -> 7. 158
18:23:48.535 -> 8. 153
18:23:48.535 -> 9. 173
18:23:48.535 -> 10. 3
18:23:48.535 -> 11. 218
18:23:48.535 -> 12. 211
18:23:48.535 -> 13. 136
18:23:48.535 -> 14. 80
18:23:48.535 -> 15. 156
18:23:48.535 -> 16. 60
18:23:48.535 -> 17. 246
18:23:48.535 -> 18. 117
18:23:48.535 -> 19. 25
18:23:48.535 -> 20. 222
18:23:48.582 -> 21. 185
18:23:48.582 -> 22. 3
18:23:48.582 -> 23. 32
18:23:48.582 -> 24. 47
18:23:48.582 -> 25. 102
18:23:48.582 -> 26. 116
18:23:48.582 -> 27. 72
18:23:48.582 -> 28. 187
18:23:48.582 -> 29. 95
18:23:48.582 -> 30. 15
18:23:48.582 -> 31. 227
18:23:48.582 -> 32. 213
18:23:48.582 -> 33. 176
18:23:48.582 -> 34. 232
18:23:48.582 -> 35. 206
18:23:48.582 -> 36. 18
18:23:48.582 -> 37. 6
18:23:48.582 -> 38. 156
18:23:48.582 -> 39. 230
18:23:48.582 -> 40. 70
18:23:48.582 -> 41. 101
18:23:48.582 -> 42. 16
18:23:48.582 -> 43. 48
18:23:48.582 -> 44. 25
18:23:48.582 -> 45. 224
18:23:48.582 -> 46. 190
18:23:48.582 -> 47. 4
18:23:48.582 -> 48. 67
18:23:48.582 -> 49. 199
18:23:48.582 -> 50. 163
18:23:48.582 -> 51. 83
18:23:48.582 -> 52. 154
18:23:48.582 -> 53. 235
18:23:48.582 -> 54. 47
18:23:48.582 -> 55. 236
18:23:48.582 -> 56. 230
18:23:48.582 -> 57. 110
18:23:48.582 -> 58. 115
18:23:48.582 -> 59. 231
18:23:48.582 -> 60. 181
18:23:48.582 -> 61. 105
18:23:48.582 -> 62. 94
18:23:48.582 -> 63. 172
18:23:48.582 -> 64. 227
18:23:48.582 -> 65. 23
18:23:48.582 -> 66. 16
18:23:48.582 -> 67. 183
18:23:48.582 -> 68. 45
18:23:48.582 -> 69. 52
18:23:48.582 -> 70. 242
18:23:48.582 -> 71. 210
18:23:48.582 -> 72. 131
18:23:48.582 -> 73. 8
18:23:48.582 -> 74. 54
18:23:48.582 -> 75. 151
18:23:48.582 -> 76. 204
18:23:48.582 -> 77. 85
18:23:48.582 -> 78. 26
18:23:48.582 -> 79. 129
18:23:48.582 -> 80. 65
18:23:48.582 -> 81. 140
18:23:48.582 -> 82. 108
18:23:48.582 -> 83. 62
18:23:48.582 -> 84. 2
18:23:48.627 -> 85. 18
18:23:48.627 -> 86. 188
18:23:48.627 -> 87. 201
18:23:48.627 -> 88. 204
18:23:48.627 -> 89. 21
18:23:48.627 -> 90. 237
18:23:48.627 -> 91. 159
18:23:48.627 -> 92. 243
18:23:48.627 -> 93. 225
18:23:48.627 -> 94. 81
18:23:48.627 -> 95. 130
18:23:48.627 -> 96. 59
18:23:48.627 -> 97. 152
18:23:48.627 -> 98. 109
18:23:48.627 -> 99. 223
18:23:48.627 -> 100. 9
18:23:48.627 -> 101. 45
18:23:48.627 -> 102. 193
18:23:48.627 -> 103. 97
18:23:48.627 -> 104. 122
18:23:48.627 -> 105. 142
18:23:48.627 -> 106. 46
18:23:48.627 -> 107. 101
18:23:48.627 -> 108. 204
18:23:48.627 -> 109. 190
18:23:48.627 -> 110. 87
18:23:48.627 -> 111. 13
18:23:48.627 -> 112. 111
18:23:48.627 -> 113. 171
18:23:48.627 -> 114. 240
18:23:48.627 -> 115. 4
18:23:48.627 -> 116. 87
18:23:48.627 -> 117. 97
18:23:48.627 -> 118. 73
18:23:48.627 -> 119. 223
18:23:48.627 -> 120. 54
18:23:48.627 -> 121. 215
18:23:48.627 -> 122. 58
18:23:48.627 -> 123. 139
18:23:48.627 -> 124. 118
18:23:48.627 -> 125. 42
18:23:48.627 -> 126. 150
18:23:48.627 -> 127. 114
18:23:48.627 -> 128. 191
18:23:48.627 -> 129. 164
18:23:48.627 -> 130. 151
18:23:48.627 -> 131. 75
18:23:48.627 -> 132. 214
18:23:48.627 -> 133. 234
18:23:48.627 -> 134. 25
18:23:48.627 -> 135. 236
18:23:48.627 -> 136. 139
18:23:48.627 -> 137. 128
18:23:48.627 -> 138. 47
18:23:48.627 -> 139. 79
18:23:48.672 -> 140. 174
18:23:48.672 -> 141. 178
18:23:48.672 -> 142. 205
18:23:48.672 -> 143. 187
18:23:48.672 -> 144. 168
18:23:48.672 -> 145. 55
18:23:48.672 -> 146. 232
18:23:48.672 -> 147. 77
18:23:48.672 -> 148. 94
18:23:48.672 -> 149. 73
18:23:48.672 -> 150. 160
18:23:48.672 -> 151. 134
18:23:48.672 -> 152. 207
18:23:48.672 -> 153. 44
18:23:48.672 -> 154. 135
18:23:48.672 -> 155. 193
18:23:48.672 -> 156. 163
18:23:48.672 -> 157. 165
18:23:48.672 -> 158. 240
18:23:48.672 -> 159. 239
18:23:48.672 -> 160. 164
18:23:48.672 -> 161. 141
18:23:48.672 -> 162. 156
18:23:48.672 -> 163. 86
18:23:48.672 -> 164. 38
18:23:48.672 -> 165. 162
18:23:48.672 -> 166. 249
18:23:48.672 -> 167. 249
18:23:48.672 -> 168. 34
18:23:48.672 -> 169. 126
18:23:48.672 -> 170. 12
18:23:48.672 -> 171. 248
18:23:48.672 -> 172. 102
18:23:48.672 -> 173. 246
18:23:48.672 -> 174. 120
18:23:48.672 -> 175. 128
18:23:48.672 -> 176. 78
18:23:48.672 -> 177. 228
18:23:48.672 -> 178. 25
18:23:48.672 -> 179. 197
18:23:48.672 -> 180. 73
18:23:48.672 -> 181. 101
18:23:48.672 -> 182. 238
18:23:48.672 -> 183. 25
18:23:48.672 -> 184. 237
18:23:48.672 -> 185. 2
18:23:48.672 -> 186. 219
18:23:48.672 -> 187. 128
18:23:48.672 -> 188. 208
18:23:48.672 -> 189. 203
18:23:48.672 -> 190. 78
18:23:48.672 -> 191. 209
18:23:48.672 -> 192. 174
18:23:48.718 -> 193. 83
18:23:48.718 -> 194. 65
18:23:48.718 -> 195. 12
18:23:48.718 -> 196. 140
18:23:48.718 -> 197. 202
18:23:48.718 -> 198. 204
18:23:48.718 -> 199. 90
18:23:48.718 -> 200. 162
18:23:48.718 -> 201. 123
18:23:48.718 -> 202. 26
18:23:48.718 -> 203. 80
18:23:48.718 -> 204. 107
18:23:48.718 -> 205. 19
18:23:48.718 -> 206. 106
18:23:48.718 -> 207. 157
18:23:48.718 -> 208. 90
18:23:48.718 -> 209. 10
18:23:48.718 -> 210. 204
18:23:48.718 -> 211. 60
18:23:48.718 -> 212. 186
18:23:48.718 -> 213. 137
18:23:48.718 -> 214. 53
18:23:48.718 -> 215. 120
18:23:48.718 -> 216. 18
18:23:48.718 -> 217. 81
18:23:48.718 -> 218. 169
18:23:48.718 -> 219. 44
18:23:48.718 -> 220. 142
18:23:48.718 -> 221. 44
18:23:48.718 -> 222. 24
18:23:48.718 -> 223. 100
18:23:48.718 -> 224. 100
18:23:48.718 -> 225. 70
18:23:48.718 -> 226. 125
18:23:48.718 -> 227. 135
18:23:48.718 -> 228. 6
18:23:48.718 -> 229. 133
18:23:48.718 -> 230. 197
18:23:48.718 -> 231. 248
18:23:48.718 -> 232. 32
18:23:48.718 -> 233. 133
18:23:48.718 -> 234. 168
18:23:48.718 -> 235. 187
18:23:48.718 -> 236. 135
18:23:48.718 -> 237. 244
18:23:48.718 -> 238. 206
18:23:48.718 -> 239. 84
18:23:48.718 -> 240. 178
18:23:48.718 -> 241. 38
18:23:48.718 -> 242. 121
18:23:48.718 -> 243. 253
18:23:48.718 -> 244. 173
18:23:48.718 -> 245. 109
18:23:48.718 -> 246. 150
18:23:48.718 -> 247. 154
18:23:48.718 -> 248. 162
18:23:48.763 -> 249. 112
18:23:48.763 -> 250. 220
18:23:48.763 -> 251. 108
18:23:48.763 -> 252. 64
18:23:48.763 -> 253. 9
18:23:48.763 -> 254. 26
18:23:48.763 -> 255. 189
18:23:48.763 -> 256. 122
18:23:48.763 -> 257. 177
18:23:48.763 -> 258. 55
18:23:48.763 -> 259. 112
18:23:48.763 -> 260. 141
18:23:48.763 -> 261. 34
18:23:48.763 -> 262. 51
18:23:48.763 -> 263. 191
18:23:48.763 -> 264. 127
18:23:48.763 -> 265. 228
18:23:48.763 -> 266. 80
18:23:48.763 -> 267. 122
18:23:48.763 -> 268. 182
18:23:48.763 -> 269. 8
18:23:48.763 -> 270. 74
18:23:48.763 -> 271. 49
18:23:48.763 -> 272. 164
18:23:48.763 -> 273. 250
18:23:48.763 -> 274. 72
18:23:48.763 -> 275. 60
18:23:48.763 -> 276. 2
18:23:48.763 -> 277. 221
18:23:48.763 -> 278. 145
18:23:48.763 -> 279. 98
18:23:48.763 -> 280. 233
18:23:48.763 -> 281. 156
18:23:48.763 -> 282. 220
18:23:48.763 -> 283. 226
18:23:48.763 -> 284. 247
18:23:48.763 -> 285. 6
18:23:48.763 -> 286. 88
18:23:48.763 -> 287. 214
18:23:48.763 -> 288. 240
18:23:48.763 -> 289. 96
18:23:48.763 -> 290. 237
18:23:48.763 -> 291. 151
18:23:48.763 -> 292. 195
18:23:48.763 -> 293. 28
18:23:48.763 -> 294. 123
18:23:48.763 -> 295. 175
18:23:48.763 -> 296. 106
18:23:48.763 -> 297. 154
18:23:48.763 -> 298. 26
18:23:48.763 -> 299. 228
18:23:48.763 -> 300. 152
18:23:48.763 -> 301. 19
18:23:48.763 -> 302. 107
18:23:48.808 -> 303. 126
18:23:48.808 -> 304. 6
18:23:48.808 -> 305. 12
18:23:48.808 -> 306. 240
18:23:48.808 -> 307. 101
18:23:48.808 -> 308. 229
18:23:48.808 -> 309. 113
18:23:48.808 -> 310. 160
18:23:48.808 -> 311. 131
18:23:48.808 -> 312. 12
18:23:48.808 -> 313. 138
18:23:48.808 -> 314. 129
18:23:48.808 -> 315. 88
18:23:48.808 -> 316. 80
18:23:48.808 -> 317. 205
18:23:48.808 -> 318. 175
18:23:48.808 -> 319. 187
18:23:48.808 -> 320. 123
18:23:48.808 -> 321. 11
18:23:48.808 -> 322. 47
18:23:48.808 -> 323. 129
18:23:48.808 -> 324. 182
18:23:48.808 -> 325. 193
18:23:48.808 -> 326. 160
18:23:48.808 -> 327. 65
18:23:48.808 -> 328. 144
18:23:48.808 -> 329. 253
18:23:48.808 -> 330. 112
18:23:48.808 -> 331. 168
18:23:48.808 -> 332. 233
18:23:48.808 -> 333. 113
18:23:48.808 -> 334. 159
18:23:48.808 -> 335. 217
18:23:48.808 -> 336. 45
18:23:48.808 -> 337. 22
18:23:48.808 -> 338. 51
18:23:48.808 -> 339. 133
18:23:48.808 -> 340. 30
18:23:48.808 -> 341. 1
18:23:48.808 -> 342. 8
18:23:48.808 -> 343. 135
18:23:48.808 -> 344. 202
18:23:48.808 -> 345. 87
18:23:48.808 -> 346. 136
18:23:48.808 -> 347. 224
18:23:48.808 -> 348. 142
18:23:48.808 -> 349. 31
18:23:48.808 -> 350. 52
18:23:48.808 -> 351. 182
18:23:48.808 -> 352. 53
18:23:48.808 -> 353. 37
18:23:48.808 -> 354. 168
18:23:48.808 -> 355. 38
18:23:48.853 -> 356. 158
18:23:48.853 -> 357. 245
18:23:48.853 -> 358. 168
18:23:48.853 -> 359. 214
18:23:48.853 -> 360. 61
18:23:48.853 -> 361. 240
18:23:48.853 -> 362. 181
18:23:48.853 -> 363. 51
18:23:48.853 -> 364. 41
18:23:48.853 -> 365. 202
18:23:48.853 -> 366. 45
18:23:48.853 -> 367. 147
18:23:48.853 -> 368. 18
18:23:48.853 -> 369. 211
18:23:48.853 -> 370. 146
18:23:48.853 -> 371. 105
18:23:48.853 -> 372. 80
18:23:48.853 -> 373. 219
18:23:48.853 -> 374. 35
18:23:48.853 -> 375. 217
18:23:48.853 -> 376. 102
18:23:48.853 -> 377. 168
18:23:48.853 -> 378. 46
18:23:48.853 -> 379. 211
18:23:48.853 -> 380. 151
18:23:48.853 -> 381. 252
18:23:48.853 -> 382. 102
18:23:48.853 -> 383. 247
18:23:48.853 -> 384. 232
18:23:48.853 -> 385. 207
18:23:48.853 -> 386. 204
18:23:48.853 -> 387. 11
18:23:48.853 -> 388. 84
18:23:48.853 -> 389. 29
18:23:48.853 -> 390. 51
18:23:48.853 -> 391. 75
18:23:48.853 -> 392. 115
18:23:48.853 -> 393. 41
18:23:48.853 -> 394. 112
18:23:48.853 -> 395. 229
18:23:48.853 -> 396. 59
18:23:48.853 -> 397. 74
18:23:48.853 -> 398. 65
18:23:48.853 -> 399. 205
18:23:48.853 -> 400. 37
18:23:48.853 -> 401. 198
18:23:48.853 -> 402. 141
18:23:48.853 -> 403. 196
18:23:48.853 -> 404. 149
18:23:48.853 -> 405. 94
18:23:48.853 -> 406. 223
18:23:48.853 -> 407. 118
18:23:48.853 -> 408. 70
18:23:48.853 -> 409. 79
18:23:48.853 -> 410. 199
18:23:48.853 -> 411. 15
18:23:48.853 -> 412. 161
18:23:48.899 -> 413. 92
18:23:48.899 -> 414. 115
18:23:48.899 -> 415. 173
18:23:48.899 -> 416. 246
18:23:48.899 -> 417. 207
18:23:48.899 -> 418. 32
18:23:48.899 -> 419. 148
18:23:48.899 -> 420. 114
18:23:48.899 -> 421. 107
18:23:48.899 -> 422. 77
18:23:48.899 -> 423. 118
18:23:48.899 -> 424. 86
18:23:48.899 -> 425. 135
18:23:48.899 -> 426. 215
18:23:48.899 -> 427. 94
18:23:48.899 -> 428. 233
18:23:48.899 -> 429. 62
18:23:48.899 -> 430. 1
18:23:48.899 -> 431. 176
18:23:48.899 -> 432. 11
18:23:48.899 -> 433. 210
18:23:48.899 -> 434. 231
18:23:48.899 -> 435. 205
18:23:48.899 -> 436. 126
18:23:48.899 -> 437. 95
18:23:48.899 -> 438. 250
18:23:48.899 -> 439. 80
18:23:48.899 -> 440. 243
18:23:48.899 -> 441. 166
18:23:48.899 -> 442. 2
18:23:48.899 -> 443. 153
18:23:48.899 -> 444. 180
18:23:48.899 -> 445. 204
18:23:48.899 -> 446. 1
18:23:48.899 -> 447. 110
18:23:48.899 -> 448. 230
18:23:48.899 -> 449. 157
18:23:48.899 -> 450. 140
18:23:48.899 -> 451. 7
18:23:48.899 -> 452. 168
18:23:48.899 -> 453. 150
18:23:48.899 -> 454. 81
18:23:48.899 -> 455. 97
18:23:48.899 -> 456. 60
18:23:48.899 -> 457. 147
18:23:48.899 -> 458. 194
18:23:48.899 -> 459. 41
18:23:48.899 -> 460. 49
18:23:48.899 -> 461. 197
18:23:48.899 -> 462. 86
18:23:48.899 -> 463. 177
18:23:48.899 -> 464. 193
18:23:48.899 -> 465. 144
18:23:48.945 -> 466. 199
18:23:48.945 -> 467. 38
18:23:48.945 -> 468. 224
18:23:48.945 -> 469. 184
18:23:48.945 -> 470. 253
18:23:48.945 -> 471. 37
18:23:48.945 -> 472. 133
18:23:48.945 -> 473. 145
18:23:48.945 -> 474. 107
18:23:48.945 -> 475. 40
18:23:48.945 -> 476. 80
18:23:48.945 -> 477. 127
18:23:48.945 -> 478. 173
18:23:48.945 -> 479. 226
18:23:48.945 -> 480. 246
18:23:48.945 -> 481. 186
18:23:48.945 -> 482. 4
18:23:48.945 -> 483. 247
18:23:48.945 -> 484. 226
18:23:48.945 -> 485. 204
18:23:48.945 -> 486. 247
18:23:48.945 -> 487. 242
18:23:48.945 -> 488. 4
18:23:48.945 -> 489. 150
18:23:48.945 -> 490. 88
18:23:48.945 -> 491. 176
18:23:48.945 -> 492. 149
18:23:48.945 -> 493. 149
18:23:48.945 -> 494. 108
18:23:48.945 -> 495. 239
18:23:48.945 -> 496. 60
18:23:48.945 -> 497. 219
18:23:48.945 -> 498. 7
18:23:48.945 -> 499. 204
18:23:48.945 -> 500. 83
18:23:48.945 -> 501. 106
18:23:48.945 -> 502. 216
18:23:48.945 -> 503. 83
18:23:48.945 -> 504. 153
18:23:48.945 -> 505. 178
18:23:48.945 -> 506. 187
18:23:48.945 -> 507. 50
18:23:48.945 -> 508. 162
18:23:48.945 -> 509. 240
18:23:48.945 -> 510. 233
18:23:48.945 -> 511. 202
18:23:48.945 -> 512. 152
18:23:48.945 -> 513. 100
18:23:48.945 -> 514. 205
18:23:48.945 -> 515. 121
18:23:48.945 -> 516. 221
18:23:48.945 -> 517. 168
18:23:48.945 -> 518. 80
18:23:48.945 -> 519. 156
18:23:48.945 -> 520. 166
18:23:48.945 -> 521. 157
18:23:48.990 -> 522. 61
18:23:48.990 -> 523. 24
18:23:48.990 -> 524. 220
18:23:48.990 -> 525. 74
18:23:48.990 -> 526. 134
18:23:48.990 -> 527. 81
18:23:48.990 -> 528. 70
18:23:48.990 -> 529. 123
18:23:48.990 -> 530. 103
18:23:48.990 -> 531. 90
18:23:48.990 -> 532. 198
18:23:48.990 -> 533. 49
18:23:48.990 -> 534. 236
18:23:48.990 -> 535. 154
18:23:48.990 -> 536. 162
18:23:48.990 -> 537. 129
18:23:48.990 -> 538. 24
18:23:48.990 -> 539. 118
18:23:48.990 -> 540. 107
18:23:48.990 -> 541. 228
18:23:48.990 -> 542. 39
18:23:48.990 -> 543. 16
18:23:48.990 -> 544. 176
18:23:48.990 -> 545. 143
18:23:48.990 -> 546. 55
18:23:48.990 -> 547. 52
18:23:48.990 -> 548. 85
18:23:48.990 -> 549. 158
18:23:48.990 -> 550. 114
18:23:48.990 -> 551. 68
18:23:48.990 -> 552. 237
18:23:48.990 -> 553. 116
18:23:48.990 -> 554. 234
18:23:48.990 -> 555. 107
18:23:48.990 -> 556. 115
18:23:48.990 -> 557. 13
18:23:48.990 -> 558. 6
18:23:48.990 -> 559. 2
18:23:48.990 -> 560. 7
18:23:48.990 -> 561. 234
18:23:48.990 -> 562. 6
18:23:48.990 -> 563. 164
18:23:48.990 -> 564. 170
18:23:48.990 -> 565. 214
18:23:48.990 -> 566. 133
18:23:48.990 -> 567. 152
18:23:48.990 -> 568. 186
18:23:48.990 -> 569. 5
18:23:48.990 -> 570. 144
18:23:48.990 -> 571. 137
18:23:48.990 -> 572. 95
18:23:48.990 -> 573. 36
18:23:48.990 -> 574. 220
18:23:48.990 -> 575. 133
18:23:49.035 -> 576. 42
18:23:49.035 -> 577. 92
18:23:49.035 -> 578. 225
18:23:49.035 -> 579. 90
18:23:49.035 -> 580. 54
18:23:49.035 -> 581. 24
18:23:49.035 -> 582. 23
18:23:49.035 -> 583. 10
18:23:49.035 -> 584. 184
18:23:49.035 -> 585. 176
18:23:49.035 -> 586. 101
18:23:49.035 -> 587. 208
18:23:49.035 -> 588. 111
18:23:49.035 -> 589. 20
18:23:49.035 -> 590. 20
18:23:49.035 -> 591. 160
18:23:49.035 -> 592. 139
18:23:49.035 -> 593. 168
18:23:49.035 -> 594. 111
18:23:49.035 -> 595. 8
18:23:49.035 -> 596. 61
18:23:49.035 -> 597. 227
18:23:49.035 -> 598. 248
18:23:49.035 -> 599. 117
18:23:49.035 -> 600. 57
18:23:49.035 -> 601. 38
18:23:49.035 -> 602. 63
18:23:49.035 -> 603. 110
18:23:49.035 -> 604. 96
18:23:49.035 -> 605. 158
18:23:49.035 -> 606. 243
18:23:49.035 -> 607. 8
18:23:49.035 -> 608. 238
18:23:49.035 -> 609. 67
18:23:49.035 -> 610. 192
18:23:49.035 -> 611. 10
18:23:49.035 -> 612. 59
18:23:49.035 -> 613. 41
18:23:49.035 -> 614. 247
18:23:49.035 -> 615. 44
18:23:49.035 -> 616. 101
18:23:49.035 -> 617. 116
18:23:49.035 -> 618. 230
18:23:49.035 -> 619. 224
18:23:49.035 -> 620. 175
18:23:49.035 -> 621. 127
18:23:49.035 -> 622. 231
18:23:49.035 -> 623. 155
18:23:49.035 -> 624. 230
18:23:49.035 -> 625. 108
18:23:49.035 -> 626. 2
18:23:49.035 -> 627. 49
18:23:49.035 -> 628. 30
18:23:49.035 -> 629. 30
18:23:49.080 -> 630. 107
18:23:49.080 -> 631. 218
18:23:49.080 -> 632. 245
18:23:49.080 -> 633. 15
18:23:49.080 -> 634. 18
18:23:49.080 -> 635. 131
18:23:49.080 -> 636. 101
18:23:49.080 -> 637. 64
18:23:49.080 -> 638. 140
18:23:49.080 -> 639. 43
18:23:49.080 -> 640. 102
18:23:49.080 -> 641. 192
18:23:49.080 -> 642. 105
18:23:49.080 -> 643. 69
18:23:49.080 -> 644. 244
18:23:49.080 -> 645. 180
18:23:49.080 -> 646. 132
18:23:49.080 -> 647. 142
18:23:49.080 -> 648. 249
18:23:49.080 -> 649. 144
18:23:49.080 -> 650. 180
18:23:49.080 -> 651. 235
18:23:49.080 -> 652. 155
18:23:49.080 -> 653. 153
18:23:49.080 -> 654. 6
18:23:49.080 -> 655. 111
18:23:49.080 -> 656. 53
18:23:49.080 -> 657. 122
18:23:49.080 -> 658. 221
18:23:49.080 -> 659. 13
18:23:49.080 -> 660. 205
18:23:49.080 -> 661. 249
18:23:49.080 -> 662. 69
18:23:49.080 -> 663. 238
18:23:49.080 -> 664. 136
18:23:49.080 -> 665. 105
18:23:49.080 -> 666. 122
18:23:49.080 -> 667. 247
18:23:49.080 -> 668. 67
18:23:49.080 -> 669. 221
18:23:49.080 -> 670. 179
18:23:49.080 -> 671. 115
18:23:49.080 -> 672. 58
18:23:49.080 -> 673. 127
18:23:49.080 -> 674. 117
18:23:49.080 -> 675. 35
18:23:49.080 -> 676. 207
18:23:49.080 -> 677. 252
18:23:49.080 -> 678. 152
18:23:49.080 -> 679. 154
18:23:49.080 -> 680. 108
18:23:49.080 -> 681. 229
18:23:49.080 -> 682. 18
18:23:49.125 -> 683. 189
18:23:49.125 -> 684. 95
18:23:49.125 -> 685. 61
18:23:49.125 -> 686. 131
18:23:49.125 -> 687. 90
18:23:49.125 -> 688. 131
18:23:49.125 -> 689. 135
18:23:49.125 -> 690. 203
18:23:49.125 -> 691. 192
18:23:49.125 -> 692. 150
18:23:49.125 -> 693. 166
18:23:49.125 -> 694. 188
18:23:49.125 -> 695. 161
18:23:49.125 -> 696. 19
18:23:49.125 -> 697. 48
18:23:49.125 -> 698. 166
18:23:49.125 -> 699. 88
18:23:49.125 -> 700. 18
18:23:49.125 -> 701. 204
18:23:49.125 -> 702. 176
18:23:49.125 -> 703. 129
18:23:49.125 -> 704. 82
18:23:49.125 -> 705. 127
18:23:49.125 -> 706. 13
18:23:49.125 -> 707. 231
18:23:49.125 -> 708. 76
18:23:49.125 -> 709. 69
18:23:49.125 -> 710. 99
18:23:49.125 -> 711. 200
18:23:49.125 -> 712. 139
18:23:49.125 -> 713. 121
18:23:49.125 -> 714. 21
18:23:49.125 -> 715. 50
18:23:49.125 -> 716. 116
18:23:49.125 -> 717. 237
18:23:49.125 -> 718. 8
18:23:49.125 -> 719. 78
18:23:49.125 -> 720. 32
18:23:49.125 -> 721. 15
18:23:49.125 -> 722. 168
18:23:49.125 -> 723. 115
18:23:49.125 -> 724. 19
18:23:49.125 -> 725. 149
18:23:49.125 -> 726. 121
18:23:49.125 -> 727. 101
18:23:49.125 -> 728. 248
18:23:49.125 -> 729. 163
18:23:49.125 -> 730. 116
18:23:49.125 -> 731. 133
18:23:49.125 -> 732. 24
18:23:49.125 -> 733. 26
18:23:49.125 -> 734. 178
18:23:49.125 -> 735. 237
18:23:49.125 -> 736. 20
18:23:49.125 -> 737. 211
18:23:49.125 -> 738. 241
18:23:49.125 -> 739. 17
18:23:49.171 -> 740. 107
18:23:49.171 -> 741. 64
18:23:49.171 -> 742. 25
18:23:49.171 -> 743. 112
18:23:49.171 -> 744. 206
18:23:49.171 -> 745. 59
18:23:49.171 -> 746. 251
18:23:49.171 -> 747. 152
18:23:49.171 -> 748. 187
18:23:49.171 -> 749. 33
18:23:49.171 -> 750. 36
18:23:49.171 -> 751. 101
18:23:49.171 -> 752. 8
18:23:49.171 -> 753. 133
18:23:49.171 -> 754. 81
18:23:49.171 -> 755. 104
18:23:49.171 -> 756. 191
18:23:49.171 -> 757. 122
18:23:49.171 -> 758. 171
18:23:49.171 -> 759. 28
18:23:49.171 -> 760. 203
18:23:49.171 -> 761. 168
18:23:49.171 -> 762. 251
18:23:49.171 -> 763. 224
18:23:49.171 -> 764. 163
18:23:49.171 -> 765. 186
18:23:49.171 -> 766. 37
18:23:49.171 -> 767. 196
18:23:49.171 -> 768. 42
18:23:49.171 -> 769. 220
18:23:49.171 -> 770. 61
18:23:49.171 -> 771. 89
18:23:49.171 -> 772. 13
18:23:49.171 -> 773. 206
18:23:49.171 -> 774. 185
18:23:49.171 -> 775. 188
18:23:49.171 -> 776. 39
18:23:49.171 -> 777. 183
18:23:49.171 -> 778. 191
18:23:49.171 -> 779. 2
18:23:49.171 -> 780. 89
18:23:49.171 -> 781. 217
18:23:49.171 -> 782. 175
18:23:49.171 -> 783. 203
18:23:49.171 -> 784. 95
18:23:49.171 -> 785. 111
18:23:49.171 -> 786. 21
18:23:49.171 -> 787. 130
18:23:49.171 -> 788. 29
18:23:49.171 -> 789. 164
18:23:49.171 -> 790. 207
18:23:49.171 -> 791. 48
18:23:49.171 -> 792. 196
18:23:49.217 -> 793. 33
18:23:49.217 -> 794. 245
18:23:49.217 -> 795. 199
18:23:49.217 -> 796. 233
18:23:49.217 -> 797. 123
18:23:49.217 -> 798. 43
18:23:49.217 -> 799. 130
18:23:49.217 -> 800. 26
18:23:49.217 -> 801. 233
18:23:49.217 -> 802. 180
18:23:49.217 -> 803. 126
18:23:49.217 -> 804. 70
18:23:49.217 -> 805. 192
18:23:49.217 -> 806. 68
18:23:49.217 -> 807. 248
18:23:49.217 -> 808. 43
18:23:49.217 -> 809. 152
18:23:49.217 -> 810. 239
18:23:49.217 -> 811. 235
18:23:49.217 -> 812. 115
18:23:49.217 -> 813. 144
18:23:49.217 -> 814. 164
18:23:49.217 -> 815. 6
18:23:49.217 -> 816. 138
18:23:49.217 -> 817. 45
18:23:49.217 -> 818. 244
18:23:49.217 -> 819. 194
18:23:49.217 -> 820. 97
18:23:49.217 -> 821. 62
18:23:49.217 -> 822. 49
18:23:49.217 -> 823. 19
18:23:49.217 -> 824. 8
18:23:49.217 -> 825. 29
18:23:49.217 -> 826. 142
18:23:49.217 -> 827. 239
18:23:49.217 -> 828. 214
18:23:49.217 -> 829. 64
18:23:49.217 -> 830. 22
18:23:49.217 -> 831. 125
18:23:49.217 -> 832. 162
18:23:49.217 -> 833. 120
18:23:49.217 -> 834. 87
18:23:49.217 -> 835. 66
18:23:49.217 -> 836. 122
18:23:49.217 -> 837. 99
18:23:49.217 -> 838. 212
18:23:49.217 -> 839. 37
18:23:49.217 -> 840. 34
18:23:49.217 -> 841. 11
18:23:49.217 -> 842. 17
18:23:49.217 -> 843. 148
18:23:49.217 -> 844. 137
18:23:49.217 -> 845. 107
18:23:49.217 -> 846. 192
18:23:49.217 -> 847. 95
18:23:49.217 -> 848. 111
18:23:49.217 -> 849. 108
18:23:49.262 -> 850. 192
18:23:49.262 -> 851. 201
18:23:49.262 -> 852. 215
18:23:49.262 -> 853. 126
18:23:49.262 -> 854. 152
18:23:49.262 -> 855. 38
18:23:49.262 -> 856. 11
18:23:49.262 -> 857. 235
18:23:49.262 -> 858. 30
18:23:49.262 -> 859. 51
18:23:49.262 -> 860. 141
18:23:49.262 -> 861. 209
18:23:49.262 -> 862. 76
18:23:49.262 -> 863. 201
18:23:49.262 -> 864. 15
18:23:49.262 -> 865. 129
18:23:49.262 -> 866. 35
18:23:49.262 -> 867. 243
18:23:49.262 -> 868. 78
18:23:49.262 -> 869. 129
18:23:49.262 -> 870. 240
18:23:49.262 -> 871. 219
18:23:49.262 -> 872. 187
18:23:49.262 -> 873. 53
18:23:49.262 -> 874. 81
18:23:49.262 -> 875. 8
18:23:49.262 -> 876. 136
18:23:49.262 -> 877. 159
18:23:49.262 -> 878. 175
18:23:49.262 -> 879. 193
18:23:49.262 -> 880. 54
18:23:49.262 -> 881. 61
18:23:49.262 -> 882. 139
18:23:49.262 -> 883. 93
18:23:49.262 -> 884. 29
18:23:49.262 -> 885. 82
18:23:49.262 -> 886. 196
18:23:49.262 -> 887. 246
18:23:49.262 -> 888. 25
18:23:49.262 -> 889. 252
18:23:49.262 -> 890. 203
18:23:49.262 -> 891. 241
18:23:49.262 -> 892. 51
18:23:49.262 -> 893. 187
18:23:49.262 -> 894. 29
18:23:49.262 -> 895. 245
18:23:49.262 -> 896. 100
18:23:49.262 -> 897. 148
18:23:49.262 -> 898. 32
18:23:49.262 -> 899. 14
18:23:49.262 -> 900. 74
18:23:49.262 -> 901. 220
18:23:49.262 -> 902. 4
18:23:49.262 -> 903. 137
18:23:49.307 -> 904. 98
18:23:49.307 -> 905. 199
18:23:49.307 -> 906. 120
18:23:49.307 -> 907. 39
18:23:49.307 -> 908. 252
18:23:49.307 -> 909. 179
18:23:49.307 -> 910. 69
18:23:49.307 -> 911. 41
18:23:49.307 -> 912. 46
18:23:49.307 -> 913. 119
18:23:49.307 -> 914. 88
18:23:49.307 -> 915. 124
18:23:49.307 -> 916. 36
18:23:49.307 -> 917. 22
18:23:49.307 -> 918. 220
18:23:49.307 -> 919. 181
18:23:49.307 -> 920. 136
18:23:49.307 -> 921. 58
18:23:49.307 -> 922. 97
18:23:49.307 -> 923. 31
18:23:49.307 -> 924. 107
18:23:49.307 -> 925. 170
18:23:49.307 -> 926. 133
18:23:49.307 -> 927. 106
18:23:49.307 -> 928. 86
18:23:49.307 -> 929. 150
18:23:49.307 -> 930. 236
18:23:49.307 -> 931. 175
18:23:49.307 -> 932. 253
18:23:49.307 -> 933. 66
18:23:49.307 -> 934. 68
18:23:49.307 -> 935. 4
18:23:49.307 -> 936. 72
18:23:49.307 -> 937. 185
18:23:49.307 -> 938. 5
18:23:49.307 -> 939. 88
18:23:49.307 -> 940. 20
18:23:49.307 -> 941. 193
18:23:49.307 -> 942. 204
18:23:49.307 -> 943. 55
18:23:49.307 -> 944. 208
18:23:49.307 -> 945. 162
18:23:49.307 -> 946. 224
18:23:49.307 -> 947. 42
18:23:49.307 -> 948. 144
18:23:49.307 -> 949. 241
18:23:49.307 -> 950. 156
18:23:49.307 -> 951. 117
18:23:49.307 -> 952. 7
18:23:49.307 -> 953. 8
18:23:49.307 -> 954. 186
18:23:49.307 -> 955. 82
18:23:49.307 -> 956. 226
18:23:49.307 -> 957. 66
18:23:49.353 -> 958. 78
18:23:49.353 -> 959. 90
18:23:49.353 -> 960. 111
18:23:49.353 -> 961. 137
18:23:49.353 -> 962. 135
18:23:49.353 -> 963. 233
18:23:49.353 -> 964. 12
18:23:49.353 -> 965. 32
18:23:49.353 -> 966. 57
18:23:49.353 -> 967. 130
18:23:49.353 -> 968. 133
18:23:49.353 -> 969. 205
18:23:49.353 -> 970. 248
18:23:49.353 -> 971. 213
18:23:49.353 -> 972. 48
18:23:49.353 -> 973. 202
18:23:49.353 -> 974. 66
18:23:49.353 -> 975. 146
18:23:49.353 -> 976. 39
18:23:49.353 -> 977. 246
18:23:49.353 -> 978. 45
18:23:49.353 -> 979. 185
18:23:49.353 -> 980. 2
18:23:49.353 -> 981. 126
18:23:49.353 -> 982. 187
18:23:49.353 -> 983. 236
18:23:49.353 -> 984. 80
18:23:49.353 -> 985. 162
18:23:49.353 -> 986. 52
18:23:49.353 -> 987. 157
18:23:49.353 -> 988. 89
18:23:49.353 -> 989. 151
18:23:49.353 -> 990. 125
18:23:49.353 -> 991. 3
18:23:49.353 -> 992. 144
18:23:49.353 -> 993. 190
18:23:49.353 -> 994. 139
18:23:49.353 -> 995. 21
18:23:49.353 -> 996. 42
18:23:49.353 -> 997. 145
18:23:49.353 -> 998. 214
18:23:49.353 -> 999. 149

Receiver debug output:

ets Jul 29 2019 12:21:46

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13864
load:0x40080400,len:3608
entry 0x400805f0
Received data packet:
stat = 1
len = 997
DATA:
3. 245
4. 134
5. 147
6. 108
7. 158
8. 153
9. 173
10. 3
11. 218
12. 211
13. 136
14. 80
15. 156
16. 60
17. 246
18. 117
19. 25
20. 222
21. 185
22. 3
23. 32
24. 47
25. 102
26. 116
27. 72
28. 187
29. 95
30. 15
31. 227
32. 213
33. 176
34. 232
35. 206
36. 18
37. 6
38. 156
39. 230
40. 70
41. 101
42. 16
43. 48
44. 25
45. 224
46. 190
47. 4
48. 67
49. 199
50. 163
51. 83
52. 154
53. 235
54. 47
55. 236
56. 230
57. 110
58. 115
59. 231
60. 181
61. 105
62. 94
63. 172
64. 227
65. 23
66. 16
67. 183
68. 45
69. 52
70. 242
71. 210
72. 131
73. 8
74. 54
75. 151
76. 204
77. 85
78. 26
79. 129
80. 65
81. 140
82. 108
83. 62
84. 2
85. 18
86. 188
87. 201
88. 204
89. 21
90. 237
91. 159
92. 243
93. 225
94. 81
95. 130
96. 59
97. 152
98. 109
99. 223
100. 9
101. 45
102. 193
103. 97
104. 122
105. 142
106. 46
107. 101
108. 204
109. 190
110. 87
111. 13
112. 111
113. 171
114. 240
115. 4
116. 87
117. 97
118. 73
119. 223
120. 255
121. 255
122. 255
123. 255
124. 255
125. 255
126. 255
127. 255
128. 255
129. 255
130. 255
131. 255
132. 255
133. 255
134. 255
135. 255
136. 255
137. 255
138. 255
139. 255
140. 255
141. 255
142. 255
143. 255
144. 255
145. 255
146. 255
147. 255
148. 255
149. 255
150. 255
151. 255
152. 255
153. 255
154. 255
155. 255
156. 255
157. 255
158. 255
159. 255
160. 255
161. 255
162. 255
163. 255
164. 255
165. 255
166. 255
167. 255
168. 255
169. 255
170. 255
171. 255
172. 255
173. 255
174. 255
175. 255
176. 255
177. 255
178. 255
179. 255
180. 255
181. 255
182. 255
183. 255
184. 255
185. 255
186. 255
187. 255
188. 255
189. 255
190. 255
191. 255
192. 255
193. 255
194. 255
195. 255
196. 255
197. 255
198. 255
199. 255
200. 255
201. 255
202. 255
203. 255
204. 255
205. 255
206. 255
207. 255
208. 255
209. 255
210. 255
211. 255
212. 255
213. 255
214. 255
215. 255
216. 255
217. 255
218. 255
219. 255
220. 255
221. 255
222. 255
223. 255
224. 255
225. 255
226. 255
227. 255
228. 255
229. 255
230. 255
231. 255
232. 255
233. 255
234. 255
235. 255
236. 255
237. 255
238. 255
239. 255
240. 255
241. 255
242. 255
243. 255
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Received data packet:
ets Jul 29 2019 12:21:46

rst:0x8 (TG1WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13864
load:0x40080400,len:3608
entry 0x400805f0

guix · September 21, 2022, 4:56pm

Hello

Your receiver code is wrong because it will read inexistant bytes, because they did not yet arrived into the serial buffer. You have to make sure there are bytes to be read (Sender.available() returns the number of bytes in the buffer)

Koepel · September 21, 2022, 4:58pm

You test is too complex, I think that it can be simpler.
Do you have a usb-logic-analyzer to capture the data ?

Could you do this:

I thought that "HardwareSerial Sender(2);" was no longer needed. Can you try Serial2 without that line ?
Make an array of 1000 bytes.
Set the tx buffer to 1024 for the sender with "setTxBufferSize()", that is with a "T" from "Tx".
Measure the time (using millis) to transmit those bytes with a single Serial.write().
The receiver should read only one byte if only one byte is available(). You may not read more.

Show both sketches.

[UPDATE] I can not check the working of "Serial2.setTxBufferSize(1024)" in the Wokwi simulator. It does not seem to work.

christop · September 21, 2022, 9:06pm

Serial communication always chops up messages into smaller "packages" (bytes). A receiver needs to handle each incoming byte as it arrives (and possibly handle situations where, e.g., a complete message, however you or the protocol defines a "message", doesn't arrive within a certain length of time).

red_car · September 22, 2022, 4:24am

As others have mentioned this is not the correct way to read serial data.

You cannot assume all the data arrives simultaneously and is available to be read.

At 115,200 baud you will receive a byte approximate every 85 micro seconds... but the ESP32 can run ~240MHz ... so each CPU cycle is ~4 nano seconds... so much faster than the data is coming in.

You need to loop through checking the serial data, and only read it into your array when there is actually something available.

noiasca · September 22, 2022, 5:21am

the examples in Serial Input Basics should give you an idea how to program a reliable receiver.

red_car · September 22, 2022, 6:21am

If you want to confirm this is a timing issue, put a delay(100) after the read of the first byte.

wwilcz · September 23, 2022, 9:49pm

Learned the lesson. Bytes via serial arrive slower than the ESP32 can processes them. Thanks everyone for the help.

system · March 22, 2023, 9:50pm

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.

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