Quectel EG25-G Delta Radio Firmware Upgrade support - libmts-io implementation

CellularRadio::resetConnection implementations disables serial echo on connection reset.
Serial echo is disabled using ATE0 command, radio may handle it and return an OK response.

During testing I discovered that EG25 radio does not return an OK response in 100ms
(default timeout time) and this OK response may conflict with successive AT commands.

This commit adds a simple "AT" command to be executed before getVendorFirmware to "eat"
all the data accumulated in the buffer.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/MTS_IO_QuectelRadio.cpp b/src/MTS_IO_QuectelRadio.cpp
index 7d205e7..96a4980 100644
--- a/src/MTS_IO_QuectelRadio.cpp
+++ b/src/MTS_IO_QuectelRadio.cpp
@@ -1104,7 +1104,9 @@ ICellularRadio::CODE QuectelRadio::fumoWaitNewFirmware(ICellularRadio::UpdateCb&
 
         MTS::Thread::sleep(10000);
 
-        if (getVendorFirmware(sQuectelFirmware) != SUCCESS) {
+        // sendBasicCommand "eats" and clears all the extra data present in the buffer,
+        // both commands shall succeed
+        if (sendBasicCommand("AT") != SUCCESS || getVendorFirmware(sQuectelFirmware) != SUCCESS) {
             // The radio is probably unavailable
             resetConnection(100);
             continue;